200M  2.4Ghz Hifi Digital Wireless Audio Adapter Music Sound Wireless  Transmitter Receiver With Audio Cable For iPad Computer TV 

2.4GHz Digital Wireless Stereo Audio Transceiver
Product Model: AB-2425
Packing list：
1 * Transmitter（Blue indicator light）optional
1 * Receiver（Green indicator light）
2 * Audio Line
1 * User Guide

Transmitter function description
①Transmitting antenna:  The wireless signal is sent by this antenna.
②Power button:  Press and hold for 3 seconds to turn it on; press and hold for 3 seconds to turn it off.
③Status indicator light:  This Blue indicator light is always on after power on.
④Pairing  button:  The transmitter and receiver are paired and completed in the  factory, and the normal application does not need to be re-paired.

In  some cases, if the transmitter and receiver need to be re-paired,, they  all need to press the pairing button for 3 seconds at the same time  after booting up. You will see both the transmitter status indicator  light and the receiver status indicator light flashing. When the pairing  is successful, the receiver status indicator light will change from  blinking to steady.

Tips:
The  transmitter is only 15 seconds in the pairing mode. Regardless of  whether the pairing is successful or not, the transmitter will  automatically exit the pairing mode after 15 seconds, and the  transmitting indicator light will change from blinking to steady state.  Be sure to press the receiver's pairing button within 15 seconds.
If  one transmitter is required to be used in combination with multiple  receivers, each receiver must be re-paired separately with the  transmitter.
⑤Audio  input port: Plug the audio extension cable into this port and connect  it to the audio device output port through the audio extension cable.
⑥Power input port:  5V supply voltage, powered by 5V 1A power adapter.

Receiver function description
①Receiving antenna :  The wireless signal is received by this antenna.
②Power button :  Press and hold for 3 seconds to turn it on; press and hold for 3 seconds to turn it off.
③Status  indicator light :  If the receiver receives a signal after startup, the  Green indicator light is always on. If no signal is received, the Green  indicator light flashes slowly.
④Pairing  button :  The transmitter and receiver are paired and completed in the  factory, and the normal application does not need to be re-paired.
If you need to re-pair, follow the above process for pairing。
⑤Audio  output port :  Plug the audio extension cable into this port and  connect it to the signal input port of the audio amplifier via an audio  extension cable.
⑥Power input port :  5V supply voltage, powered by 5V 1A power adapter.

Parameters Table:

Warning:
1、Do not place the transmitter at a dead angle to keep the transmitted signal quality good.
2、When  using the receiver, try to avoid placing it closer to other wireless  transmitters, in order to avoid the interruption of the sound caused by  the interference of the received signal.
3、The  digital modulation of this product is wireless bidirectional  transmission, and the receiver will also transmit signals when receiving  signals.
For  very few models of audio amplifiers, this transmitted signal may  interfere with the audio and cause the noise floor to rise, if the audio  is found to be disturbed, move the receiver to avoid interference  effects.
4、This product is made up of precision parts, Do not throw, throw, throw, etc. to avoid serious damage.
5、This product is not waterproof, do not let water directly into the inside of the casing.
6、Try to stay away from the electromagnetic sound field, high-voltage transmission network, and large metal objects.