stemoscope PRO LITE STEMO500 User manual

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Smart Wireless Stethoscope
(Model: STEMO500)
Instruction Manual
(DRAFT)

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SAFETY WARNINGS AND PRECAUTIONS
Consult your physician before using the
device if you are not a medical professional.
Keep Stemoscope PRO LITE at least 1 meter
away from all radio frequency (RF) emitters,
including WIFI routers and radios. DO NOT
use Stemoscope PRO LITE near strong RF
signals or portable and/or mobile RF devices.
If sudden or unexpected sounds are heard,
move away from any radio transmitting
antennas.
Bluetooth Class 2 is used for data
transmission. Its maximum radio frequency
field strength is considered safe to use with
other medical devices. However, audio, video,
and other similar equipment may cause
electromagnetic interference. If such devices
are encountered, and cause interference,
immediately move Stemoscope PRO LITE
away from that device and/or switch OFF
Stemoscope PRO LITE.
Store Stemoscope PRO LITE and components
in a clean and safe place out of the reach of
infants and children.

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DO NOT move, slide or push the switch
button when Stemoscope PRO LITE is wet. If
you do so, liquid droplets may go into the
device and damage the internal electrical
circuitry.
Recharge the battery using only the provided
charging cable with a UL-certified charger
(not provided). DO NOT use Stemoscope PRO
LITE when it is being charged.
DO NOT subject the device to extreme
temperatures, humidity, or direct sunlight.
DO NOT subject the device to strong shocks,
such as dropping the unit on the floor.
The working distance will be reduced when
objects (walls, furniture, people, etc.) are
between Stemoscope PRO LITE and the
connected phone or earphones. To improve
Bluetooth connection, reduce the distance
and/or allow a line of sight between
Stemoscope PRO LITE and the connected
phone or earphones.
No modification of this equipment is allowed.
Switch off Stemoscope PRO LITE to save the
battery power when not in use.

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CONTENT
SAFETY WARNINGS AND PRECAUTIONS ...............2
1. Introduction .......................................................................5
1.1. Indications for use .....................................................5
1.2. Specifications and technical data...................6
1.3. Signs and symbols.....................................................7
1.4. Package contents ......................................................8
2. Hardware identification............................................8
3. Basic steps to listen to the sounds.....................10
4. Record a video composed of the auscultatory
sounds and the camera view ............................................16
5. Record the sounds on a predefined body spot
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6. More features for medical professionals ........18
7. Live stream the auscultatory sounds ............... 21
8. Share (send) a recording.......................................... 27
9. Care, cleaning, and disinfection..........................28
10. Data security .............................................................28
11. Trouble shooting ......................................................... 29
12. Electrical Safety ....................................................... 31
13. FCC Statement ........................................................ 36
14. Disposal.........................................................................36
15. Warranty....................................................................... 37
16. Contact information ........................................... 37

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1. Introduction
Stemoscope PRO LITE (Model: STEMO500) is a
smart wireless noise-cancelling stethoscope. It
transmits audio to the “DrStemo” app installed on
a smartphone. The “DrStemo”app provides rich
functions such as amplification, visualization,
filtering, recording, sharing, etc. The app also
allows a user to access premium cloud services,
including video call service and cloud data storage.
Before your first use, please read the manual
carefully and follow all the instructions. Please
contact us if you encountered any problems.
1.1. Indications for use
The Stemoscope PRO LITE is designed for medical
professionals or lay users to auscultate, record, and
transmit sounds from the heart, lungs, abdomen,
arteries, veins, and other internal organs. The
device is intended for medical diagnostics
purposes but not for self-diagnosis.

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1.2. Specifications and technical data
Item
Description
Supported
phones
iOS: 9.0 or above
Android: 7.0 or above
Frequency range
20 – 2000 Hz
Working distance
< 2 meters typically
Transportation
And storage
-10 °C to +60 °C / 15 %RH to
85 %RH / 800 hPa to 1060
hPa
Operating
conditions
+10 °C to +40 °C / 15 %RH to
85 %RH / 800 hPa to 1060
hPa
The time required for Stemoscope PRO LITE to warm
from the minimum storage temperature （-25°C ）
between uses until it is ready for intended use when
the ambient temperature is 20°C: 1 hour.
The time required for Stemoscope PRO LITE to cool
from the maximum storage temperature （70°C ）
between uses until it is ready for intended use when
the ambient temperature is 20°C: 1 hour.

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1.3. Signs and symbols
Follow operating instructions
Indicates the manufacturer of the unit,
including manufacturer’s name and address
The device must be disposed of properly
when it will no longer be used. Dispose
medical waste based on local regulations and
comply with applicable laws.
Indicates the Batch Code
Attention, see instructions for use
MR Unsafe
Bluetooth

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1.4. Package contents
Stemoscope PRO
LITE
Charging cable
Quick start guide
x1
x1
x1
2. Hardware identification
The switch in the left position is the OFF state.
Slide the switch to the right to start Stemoscope
PRO LITE.
Switch
Diaphragm
Notification light
Charge port

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The diaphragm makes contact with the human
body to pick up body sounds.
To charge Stemoscope PRO LITE, plug one end of
the charging cable into the charge port and
another end to a UL-certified USB charger (not
provided in the package).
The device status can be identified by the
notification light.
Notification light
Device status
Pulsing (smoothly
fading in and out)
Waiting for Bluetooth
connection.
Blinking
Connected but not transmitting
sound.
Consistently on
Connected and transmitting
sounds.
Off
The battery is fully charged if the
device is turned off and being
charged.
Out of battery power if the
device is turned on.

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3. Basic steps to listen to the sounds
Here are the basic steps for you to use Stemoscope
PRO LITE.
Step 1. Open the “DrStemo”app. If you haven’t
installed the “DrStemo”app, please search and
install it from Apple’s App Store or Google’s Play
Store.
The “DrStemo”App
The app user interface is customized for medical
professionals and lay users. The first time you use
the app, you will be asked to set your role. Please
choose the right one, because a wrong choice can
prevent you from using the device correctly. If you
want to change later, you need to re-install the app.
The app needs to read the QR code on the
diaphragm of your Stemoscope PRO LITE as
shown in the picture below. Just follow the simple

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steps to register.
Find the QR code on your Stemoscope PRO LITE
After registration, you will see the home user
interface as shown below. This user interface
shows that there is no Stemoscope PRO LITE
connected yet. Before Stemoscope PRO LITE is
connected, the “listen”button is not active.

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Home user interface before Stemoscope PRO
LITE is connected
Step 2. Slide the switch button of Stemoscope
PRO LITE to the right. The notification light will
start to smoothly fade in and out and the app will
start to search for and connect to the Stemoscope
Menu button
“listen” button
“see my
doctor” or “see
my patient”
button
depending on
your role
selection

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PRO LITE. When the Stemoscope PRO LITE is
connected, the notification light of the
Stemoscope PRO LITE will blink. Bluetooth pairing
in the phone settings is NOT needed.
The home user interface will be updated once
connected. The “listen”button will start to animate.
The battery power level of the Stemoscope PRO
LITE is displayed. When the power is low, please
charge it timely. You can press the doctor/patient
button to make a video call to your doctor/patient
if you have access to the cloud service.
Step 3. Press the “listen”button in the app to start
listening. The “listen”user interface is customized
for non-medical professionals and medical
professionals respectively. The “listen”user
interface has three themes: “video,” “heart,” and
“lung”. You can listen to the sounds in any of these
three themes. Internal phone speakers are not
good at playing body sounds that have many low-
pitched components. Therefore, please use high
quality earphones (either wired or Bluetooth) to
listen. Even if you just want to record the sounds,

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you may use earphones to monitor the sounds (for
example, holding Stemoscope PRO LITE stable
can give better quality). Please consult your doctor
on where to listen and record.
Home user interface (after Stemoscope PRO LITE
is connected)
The battery
level of the
connected
stethoscope
Animated
“listen” button
after
connection.
Press it to
listen.

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The “video”theme of the “listen”user interface
The sound
waveform
Select one of
the themes by
pressing the
button. “video”
is selected in
this example
Bluetooth signal strength
Battery power level
Switch the
front and back
camera
Record button
Noise
cancelling
switch
Option to
record screen

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4. Record a video composed of the auscultatory
sounds and the camera view
You can use the “video”theme of the “listen”user
interface to record a video composed of the video
showing where Stemoscope PRO LITE is placed
and the sounds transmitted from this Stemoscope
PRO LITE. Sounds from different body spots may
have different characteristics, so it is critical to
know what part of the body emitted those sounds.
A video can record the sounds and associated
location of the Stemoscope PRO LITE. When you
do the recording, please make sure the location of
the Stemoscope PRO LITE can be determined in
the camera view. For example, a doctor may
determine the spot based on its relative location to
the neck. Using the “video”theme for recording is
the preferred recording option if you are not sure
about the correct spots for listening.
5. Record the sounds on a predefined body
spot
Besides the “video” theme in the “listen” user
interface, there are another two themes: “heart”

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and “lung,”providing some predefined spots to
save heart sounds and lung sounds respectively.
The following picture shows the “heart” theme.
You can place Stemoscope PRO LITE on one of the
body spots shown in this user interface and press
the corresponding “red dot”recording button to
record the corresponding sounds. You may choose
to screen record so that the sounds and the
waveform displayed on the screen can be
composed into a single video file. To do so, toggle
on the screen recording option button before you
press the “red dot”recording button. When you
look at the picture that shows the interested body
spots (red dots), pay attention to the orientation
of the human body marked with right-hand side
and left-hand side. Make sure you do not mix the
left and the right of the human body where the
Stemoscope PRO LITE is placed.

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The “heart”theme of the “listen”user interface
6. More features for medical professionals
Two extra features were provided in the “listen”
user interface for medical professionals. Medical
professionals sometimes need to filter the sounds
Record button.
Place your
device on one
of the heart
listening spots
and press this
button to
record the
sound
associated
with this
location.

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for better interpretation or record the sounds from
some body spots that are not commonly used.
⚫Choose Stemoscope PRO LITE frequency
modes
The auscultatory sounds can be filtered in three
different frequency modes: bell mode, diaphragm
mode, and extended range mode respectively. The
following table shows the frequency ranges of
these modes.
The Bell mode emphasizes the low frequency
sound, which makes the major part of normal
heart sounds, while the Diaphragm mode
weakens the low frequency sounds, which may
reduce the interference of heartbeat when you
listen to the lung sounds. The Extended range
mode covers the whole frequency range from 20-
2000 Hz. You may switch among these modes
based on your preference. We don’t make
recommendations on what frequency mode
should be used.

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Extra features for medical professionals in the
“listen”user interface
⚫Record on non-predefined auscultation
spots
Stethoscope
frequency
modes for
medical
professionals
Non-
predefined
recording spot