DynaVox Series 5 User manual

© 2006, 2010 DynaVox Systems LLC
All rights reserved. No part of this book may be reproduced, stored in a retrieval system, or transmitted in any form, by any means (electronic,
photocopying, recording, or otherwise) without the prior written permission of the publisher.
Copyright protection claimed includes all forms and matters of copyrightable material and information allowed by statutory or judicial law or
hereafter granted, including without limitation, material generated from the software programs which are displayed on the screen such as
screen displays, menus, etc.
Although every precaution has been taken in the preparation of this book, the publisher assumes no responsibility for errors or omissions.
In North America:
For information, write to:
DynaVox Systems LLC
2100 Wharton Street, Suite 400
Pittsburgh, Pennsylvania 15203 USA
The European Authorized Representative is:
DynaVox Systems Ltd.
Units 5 & 6 Benford Court
Lower Cape
Warwick
CV34 5DA
England
DynaVox® is a registered trademark of DynaVox Systems LLC. DynaVox V™, DynaVox Vmax+™, and DynaVox Maestro™ are registered
trademarks of DynaVox Systems LLC.
All other brand and product names mentioned are trademarks or registered trademarks of their respective holders.
Part # 401125-A
First Edition
Published July 2010
Created in the United States of America

Series 5 v1.07 - User’s Guide iii
Part # 401125-A
Table of Contents
Section 1: Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
What’s in the Box?. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1
Open or Dedicated Series 5 device . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
About this User’s Guide . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2
Emergency Use (Intended Use of This Product) . . . . . . . . . . . . . . . . . . . . . . . . . .2
Please Register Your Purchase . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Overview of Resources (How to Get Help) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Important Information about Your Series 5 Device . . . . . . . . . . . . . . . . . . . . . . . . 4
Section 2: Getting Started . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Turning On the Device. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
The Introductory Pages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Creating A User . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Choosing a Page Set . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Adding Custom Information. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Selecting a Voice . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7
Choosing Other System Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Finishing the User Setup Wizard. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
The Customized Page Set . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Learning the Software Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
The Title Bar . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10
Pages vs. Popups . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Buttons & Behaviors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Visual Scenes & Active Areas. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Important Software Menus . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Setup Menu. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Tools Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Interface Features Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Page Navigator Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Selection Method Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Setting the Selection Method . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Using the Zoom Feature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
The Zoom Toolbar. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Working with Hotspots . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .22
Adjust the Hotspot Settings. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Changing or Adjusting the Speaking Voice . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Section 3: Page Sets . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
InterAACt Page Set . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Language Use and Language Structure . . . . . . . . . . . . . . . . . . . . . . . . . . . .27
The Continuum of Communication Independence . . . . . . . . . . . . . . . . . . . . 28
Communication Skill Level & Page Content . . . . . . . . . . . . . . . . . . . . . . . . . 28
Using Visual Scenes in InterAACt. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

iv DynaVox
Quick Fires . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Navigator Page Set . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
Selecting the Navigator User . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
Navigator Page Set Structure & Contents. . . . . . . . . . . . . . . . . . . . . . . . . . . 32
Gateway Page Set. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .35
VSD (Visual Scene Display) Page Set . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .36
Section 4: Plan for Success . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
General Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
Visual Customization . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
Vocabulary Selection. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
Phase 1: Recognize . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
Phase 2: Prioritize . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
Phase 3: Organize . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
Phase 4: Criticize . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
Section 5: Modifying Pages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
Searching for Pages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
The Modify Button . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .46
Modifying a Button. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
Adding a Label to a Button . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
Adding a Text Message to a Button . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .50
Changing the Symbol on a Button . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .52
Importing a Digital Picture as a Symbol . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
Changing a Button’s Color Scheme . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .55
Modifying a Page or Popup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57
Setting the Background Color . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .58
Importing a Digital Picture as a Background Image . . . . . . . . . . . . . . . . . . .59
Modifying a Group of Pages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62
Creating a New Page or Popup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65
Creating a New Visual Scene . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68
Creating the Visual Scene Page . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68
Creating an Active Area . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .69
Modifying an Active Area . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72
Deleting an Active Area. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .73
Linking to a New Page. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73
Section 6: Rate Enhancement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77
Rate Enhancement Basics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77
Word Prediction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 79
Creating Prediction Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 79
Creating a New Dictionary Entry . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .82
Blocking Words from Prediction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 85
Using Concepts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .86
The Concept Browser Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 86

Series 5 v1.07 - User’s Guide v
Part # 401125-A
Editing a Concept . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 87
Using Phrases . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .89
The My Phrases Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 89
Adding a New Phrase . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 91
Using Phrases in Conversation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 93
Using Slots . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 95
Adding Slots to Phrases . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 95
Working with Slots in the Message Window . . . . . . . . . . . . . . . . . . . . . . . .100
Adding Slots to Button Labels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .101
Adding Slots to Button Text. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 103
Section 7: Wireless Capabilities. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 105
Remote Control Commands and Remote Control Pages . . . . . . . . . . . . . . . . .105
Programming a Default Remote . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .106
Assigning a Custom Remote Control to a Page . . . . . . . . . . . . . . . . . . . . . 111
Creating a New IR Command . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 114
Learning an IR Command . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .114
Adding an Environmental Control Behavior . . . . . . . . . . . . . . . . . . . . . . . . 116
Computer Access . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 117
Computer Access with AccessIT (Infrared). . . . . . . . . . . . . . . . . . . . . . . . .117
Computer Access with AccessIT (Bluetooth) . . . . . . . . . . . . . . . . . . . . . . .118
Section 8: Email & Internet Access . . . . . . . . . . . . . . . . . . . . . . . . . . . . 121
Connecting to the Internet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .121
Establishing a Wireless Internet Connection. . . . . . . . . . . . . . . . . . . . . . . . 122
Accessing the Internet on an Open Device . . . . . . . . . . . . . . . . . . . . . . . . . . . .124
Onscreen Keyboards . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 124
Setting Up Your DynaVox Email Account . . . . . . . . . . . . . . . . . . . . . . . . . . . . .126
Default Settings for Email . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 128
Your Email Page . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 129
Sending and Receiving Email . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .130
Sending an Email . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 130
Reading an Incoming Email . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 132
Replying to a Received Email . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .134
Section 9: Backing Up & Restoring . . . . . . . . . . . . . . . . . . . . . . . . . . . . 135
What is a “User”?. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .135
The User Manager Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .136
Save the Current User . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 136
Open a Different User . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 137
Backing Up Your Information. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 137
Restoring Your Information from a Backup . . . . . . . . . . . . . . . . . . . . . . . . . . . . 140
Upgrading Your Device Software . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .142

vi DynaVox
Appendix A: Searchable Help. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 145
Searchable Help Organization. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .146
Appendix B: Other Resources . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 147
On-Device Resources . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 147
How To Help . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .147
Video Tutorials . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 149
External Resources . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 150
Documentation on CD. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 150
Online Knowledge Base . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 150
Remote Technical Support through Your Device . . . . . . . . . . . . . . . . . . . .150
Telephone Technical Support . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .151
Appendix C: Finding the Introductory Pages. . . . . . . . . . . . . . . . . . . . . 152
Appendix D: Backup File Worksheet . . . . . . . . . . . . . . . . . . . . . . . . . . . 154
Appendix E: End-User Licence Agreement (EULA) . . . . . . . . . . . . . . . . . 156

Series 5 v1.07 - User’s Guide 1
Part # 401125-A
What’s in the Box?
Section 1: Introduction
The User’s Guide is the first step in learning to communicate with your DynaVox Series 5
device. This manual briefly introduces DynaVox terms and features. It also helps you through
the initial device setup and introduces the many ways that you can easily add you own
customized information. Once you have read through the material provided here, you will be
ready to start communicating and customizing your Series 5 device.
What’s in the Box?
When you open the shipping box, carefully remove your Series 5 device and other items from
the box. Make sure that you received all of the accessories that ship with the Series 5 device:
Your Series 5 device shipment should have included the following accessories:
•Battery
•DC power adapter/charger and power cord
•Carrying strap/handle or tabletop stand
•USB flash drive (also known as a “USB jump drive”)
•USB keyboard & mouse
•Registration card
•This User’s Guide - which includes the Quick Start Guide & CDs
•Stylus
If any of the items are missing from the box, please call DynaVox Customer and Sales Support
at 1-800-344-1778.
Open or Dedicated Series 5 device
You will receive either an open or a dedicated Series 5 device. When you placed your order,
you had to choose either the open or dedicated Series 5 device.
•An open Series 5 device can be used to run Windows computer software in addition to the
DynaVox Series 5 software. An open device is a portable computer combined with a
communication device.
•Adedicated Series 5 device can run only the DynaVox Series 5 software.
Note: Be sure to save the box and packing material. If you should ever need to
send your device back to DynaVox Technologies for repair, you will need
the box and packing material to ship it safely.

About this User’s Guide
2DynaVox
About this User’s Guide
This User’s Guide contains descriptions and instructions on performing the basic operations
of your Series 5 device. Throughout the text, you will find the following kinds of comments:
Emergency Use (Intended Use of This Product)
The Series 5 device is intended for everyday communication situations. It should not be relied
upon as a means of communicating emergency medical information. We recommend having
multiple ways to communicate information during a medical emergency.
Please Register Your Purchase
Please fill out and return the registration card that was shipped with your Series 5 device.
Without this information, we cannot know who uses our devices, or who should receive
software updates, newsletters or other product information.
Each Series 5 device has a serial number sticker on the bottom of the unit. Be sure to write the
serial number on your registration card before you mail it in. Also, take time now to copy the
serial number here so that it will be handy if you must contact someone from DynaVox
Technologies, either to check on an order for your product or to talk to someone in Technical
Support. It is especially important to do this if your device will be mounted onto a wheelchair,
since the serial number may not be readily accessible from that position.
MY DEVICE SERIAL NUMBER:_______________________________________
Note: This User’s Guide guide offers notes that are designed to point out
features that can be used to make your Series 5 device a better fit for an
individual user, or other important considerations. Notes are marked with a
flag to make them easy to find.
Reference: Many of the topics in this User’s Guide are explained in more detail
in the Searchable Help that can be launched on your Series 5
device (or the CD that came with your Series 5 device). The notes
include a key word or phrase that can be used to optimize topic
searches. Reference notes are marked with a computer mouse.
Caution: Caution notes (marked with the caution symbol) contain very important
information to help you use your Series 5 device safely, and to prevent
device damage and loss of information.

Series 5 v1.07 - User’s Guide 3
Part # 401125-A
Overview of Resources (How to Get Help)
Overview of Resources (How to Get Help)
This User’s Guide is only a brief, introductory reference to your Series 5 device. There are
other instructional resources available for the DynaVox Series 5 software, both on the Series 5
device itself and on the CDs that were shipped with the device.
To supplement this manual, your device was shipped with a CD that contains training modules
(in .pdf format) and a Searchable Help program. The training modules provide brief lessons
on frequently-used features. The Searchable Help is a comprehensive resource and includes
step-by-step instructions for every feature and operation on the Series 5 device.
In addition, an online Knowledge Base of information is available on DynaVox Technologies’
website at www.dynavoxtech.com.
DynaVox Technologies is dedicated to supporting you as you learn to use your new product.
We offer many different learning tools so you can choose the method of support that best
meets your needs.
Product Documentation
•Available in multiple formats, including Searchable Help and .pdf documents
•Provides information and training in a way that best suits diverse learning styles
•Available in small pieces that make it easy to fit training into busy schedules
Online Support (www.dynavoxtech.com)
•Knowledge Base
•Application ideas and page sharing
•Virtual Classroom
Technical Support (www.dynavoxtech.com or 1-800-344-1778)
Hours of Service: Monday through Friday, 8:00 a.m. until 7:00 p.m. (EST)
If you are not a resident of North America, please call the dealer from whom you purchased
your device.
Your DynaVox Sales Consultant (1-888-697-7332)
•Product and pricing information
•Assistance with placing orders
•If you are not a resident of North America, please call the dealer from whom you
purchased your device.
For more information, refer to Appendix A and Appendix B in this User’s Guide.

Important Information about Your Series 5 Device
4DynaVox
Important Information about Your Series 5 Device
Your Series 5 device meets all necessary international safety standards and has been tested
to meet IEC 601-1, UL/CSA 60950 and AS/NZ 60950 requirements. The Series 5 device
system is tested to medical device directive 93/42/EEC and is a Class II device. The system is
considered to be a portable device that is intended for continuous operation, not intermittent
use. This device has electrical input ratings of 19 VDC/3.1 Amps.
The device complies with Part 15, Class B of the FCC Rules. Operation is subject to the
following two conditions: (1) this device may not cause harmful interference, and (2) this
device must accept any interference received, including interference that may cause
undesired operation. The device is also tested to Canadian standard ICES-003.
When you are charging your Series 5 device, remember that the electrical outlet you will use
to power the adapter must be accessible and within 10 feet (3 meters) of the device. There
should be no switches or disconnect devices in the earth conductor.
The charger requires no routine maintenance other than a periodic inspection of the power
cords for signs of wear and damage. If the power cords show signs of wear and damage, they
should be replaced.
Caution: Your DynaVox Series 5 device contains a Lithium Ion battery. A safety
hazard may develop when the battery is placed in or near fires or
stoves, or in locations with temperatures above 113°F (45°C). These
conditions may cause the battery to generate heat, explode or ignite.
Caution: Do not perforate, disassemble or modify the battery. If you must
dispose of the battery, do so according to the local laws that apply to
the area where you live.
Caution: For safe and proper operation of your DynaVox Series 5 device, use
only chargers, batteries and accessories that have been approved by
DynaVox Technologies.
Caution: Be sure to disconnect all power before charging the battery. Except for
the battery, the DynaVox Series 5 devices contain no user-serviceable
parts.
Caution: This device presents a risk of electrical shock if the metal casing is
opened. Do not open the metal casing that surrounds the device.
Caution: The DynaVox Series 5 devices are not suitable for use in the presence
of flammable anesthetics.