CHANGSHENG A19 Wireless Audio Transmitter and Receiver User Manual
MODEL: A19
Product Diagram
TX Mode / Transmitter
About TX Mode
TX mode supports the unit connects to the devices which without wireless function, like the airplane audio, TV or computer, then transmit its audio signal by wireless to your Bluetooth earbuds, headphones or speakers.
Start to use TX Mode
Connection
Connection between the unit and the audio source devices, like the TV, airplane audio or computer, goes through the cable connection.
Once the pair completed between the unit and your earbuds, speakers or headphones, the wireless connection by Bluetooth will be available.
Function for Buttons
RX Mode / Receiver
About RX Mode
RX mode supports the unit connects to the plackback devices that without wireless function, like the car audio, Hi-Fi speakers or wired headphones, it will receive the audio signal from the notebook, mobilephones or tablets by Bluetooth then played by the connected devices.
Start to use RX Mode
Connection
Connection between the unit and the audio playback devices, like the car audio, wired headphones or speakers, goes through the cable connection. Once the pairing completed between the unit and your notebooks, tablets or mobile phones, the wireless connection by Bluetooth will be available.
Function for Buttons
Operations
Auto power off
Once the unit without connecting to any wireless devices, it will turn off automatically in 10mins later to save power consumption.
Charge the unit
Once the unit in low power level, the charging LED will be flashed 
Please connect the unit and the power adaptor (not attached) with DC 5V by the attached power cable. The charging LED will be in steady RED during charging, and it will be off when charging finished.
Reset the unit
To reset the unit, it will clean all the paired record and you will need to pair with your devices again. If necessary, please HOLD the P/R key 8 seconds, when all the LEDs turn on, it means the reset is completed.
Specifications
FAQs
Abnormal sound/no sound?
Difficult to connect to the second device?
Meet sound latancy when using?
The unit supports aptX low-latency decode (<40ms) in TX mode, if you meet significant delays, please check your paired device if it also supports the same aptX LL feature.
Which codec is used for dual connection?
When two devices connected to the unit, the codec in using will show the lowest codec that the devices supported. For example, A device supports aptX but B device only support SBC, the codec in using will be SBC.
How to pair with AirPods 3 or Pro 2?
Place the AirPods in the charging case. Open the lid and hold the button on the back of the charging case until the case’s light flashes white. Switch the unit to TX mode, double click the P/R key to start pair with AirPods.
FCC Statement
This device complies with part 15 of the FCC Rules. Operation is subject 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.
This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference in a residential installation. This equipment generates, uses and can radiate radio frequency energy and, if not installed and used in accordance with the instructions, may cause harmful interference to radio communications. However, there is no guarantee that interference will not occur in a particular installation. If this equipment does cause harmful interference to radio or television reception, which can be determined by turning the equipment off and on, the user is encouraged to try to correct the interference by one or more of the following measures:
- Reorient or relocate the receiving antenna.
- Increase the separation between the equipment and receiver.
- Connect the equipment into an outlet on a circuit different from that to which the receiver is connected.
- Consult the dealer or an experienced radio/TV technician for help.
Caution: Any changes or modifications to this device not explicitly approved by manufacturer could void your authority to operate this equipment.
RF Exposure Information
The device has been evaluated to meet general RF exposure requirement. The device can be used in portable exposure condition without restriction.
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Documents / Resources
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