CHGeek BT70 User manual

Car Bluetooth FM Transmitter
User Guide

Product Introduction
1. The device is developed for car using with 8iuetooth MP3 player, equipped
with professional high-performance Bluetooth module and MP3 decoder chip;
2. It can transmit and play stereo music from the TF card to the car through
the FM radio signal;
3. It can transmit music from mobile phone to the car audio through bluetooth;
4. You can also use this device to complete a phone hands-free system that
can communicate freely during your driving;
5. The device sends the signal wirelessly, without modifying anything in the
car, both as an entertainment music player and as a safety and accessible car
kit.
Product features
1. Please insert this device into the car cigarette lighter and then start
automatically, the screen will display the car battery voltage and monitor the
car battery at any time when working;
2. CVC technology to control noise and storm then to create full-duplex sound
quality;
3. Support the phone's A2DP function, the phone will play music directly when
connecting;
4. When the device is switched on, the phone can automatically connect to
Bluetooth;
5. Support external TF card, can play MP3 / WMA format music files;
6. Intelligent charging and high-pass fast charging program output, can be
used for car handheld equipment charging:
Orange USB port supports QC3.0 protocol: OC3.5-6.5V/3A,6.5-9V/2A,9-12V/1.5A
Blue USB port supports intelligent output current: 5v/2400MA

Operating instructions：
1. Power-on
(1) When the integrated car charger into the car cigarette lighter power
supply, the device automatically working;
(2) Select any FM frequency of this device; (In order to ensure good sound
quality equipment, please select the local no radio program blank channel)
(3) Turn on the car FM stereo and select the same frequency as the
device.
2. Frequency and Volume Adjustment
(1) The device supports the frequency of 87.5-108.0MHz, can be adjusted
with the CH+ and CH- button;
(2) Adjust the volume by rotating
3. Play music from TF card
(1) Insert the TF card into the device, will automatically detect and play TF
card MP3 / WMA / WAV format music;
(2) Music selection: Press / button to switch to previous/next song.
4. Connect the Bluetooth device
(1) The device is equipped with a built-in Bluetooth chip that can be
connected to other handheld Bluetooth devices;
(2) When the device is turned on, it will automatically enter the Bluetooth
pairing state and the screen icon will flash continuously, at this time the
device named "BT70" or "CH13" is connected;
(3) The device has a memory function that automatically connects with the
stored paired Bluetooth device when powered on;
(4) If you want to delete a stored device, please delete it in your phone's
Bluetooth pairing list.

5. Play music from your phone
(1) It can play music from your phone, when connecting your phone with
your device via Bluetooth as the device wirelessly transmit signal to the car
stereo;
(2) You can operate it either on the phone or on the device;
(3) The machine can support TF card, or you can use Bluetooth to
connect the phone, if both exist, the device defaults to the last connection
to play music.
6. Making a call
(1) You can make or receive calls via this device after finishing
connecting;
(2) Double click to redial the last number;
(3) Long press for about 3 seconds to reject a call.
7. AUX import / output
(1) AUX import: This device supports external import, through the AUX
connector to receive music sources, such as MP4\CD\etc and then the
music source will be converted to FM signal by radio;
(2) AUX output: The device supports music internal output, which can be
accepted by combining sound, car audio and portable phone.
8. Turn off the FM transmitter
Long press for 5 seconds, will turn off the FM and Bluetooth functions, the
screen will be dark and keep charging function.

Components instructions
• FM transmitter
• Manual
• Audio Line
• 4A fuse
Operation diagram

Bluetooth
• Bluetooth vision -V4.2 + EDR
• Bluetooth frequency: 2.4GHZ
• Sensitivity: -42db + /3db360
• Voltage: 5V+/-0.5
• Working current: 75mA (MAX)
• Standby current: 20Ma (MAX)
• Effective range: 5M
• Sensitivity: -92 dBm
• RF output: 4 dBm
FM frequency
• FM: 87.5MHZ-108.0MHZ
• Effective range: 2M
NOTE：
1. Widely compatible - FM radio can use Bluetooth devices such as iPhone,
iPad, iPod, tablet, smartphone or MP3, MP4 player, you can transfer music
from car audio to car radio via 3.5MM audio line;
2. Sound quality - Using the most advanced interference and noise
cancellation technology to provide the most perfect sound quality. Please note
that due to radio frequency interference and car ground loop noise, any
transmitter is almost impossible to produce perfect audio, but this product is
one of the best products on the market;
3. This product is slightly hot at work or when the car starts to pause/restart,
it’s a normal phenomenon, please don’t worry;
4. It is prohibited to be used in an environment with excessive air humidity,
which may cause an electrical fault;
5. Don’t forget to unplug the device if it won’t be used for a long time or your

car cigarette lighter can not be powered off, in case consuming battery power;
6. Please adjust the frequency in the car to a blank channel and on the device
the same frequency, if you encounter noise interference, please try a new
channel; try to avoid local radio channels, in order to avoid interference, to
obtain high-definition sound quality.
Contact us
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