SKU:SAR143 Features: Product Features: Brand new and high quality Wireless transmission up to 50meters Easy to install and operate Can be connected to an y3.5mm Auido. Transmitting frequency: 2.4GHz Caution: First， the audio transmission frequency of this device is 2.4G， and a wireless router is a band ( but different channels ) ， please keep the router Certain distance ( best to try more than 2 meters away from the router ) . Second， the signal transmission device for fan diffusion theory ， so please do not transmit or receive side device placed in the corner ， not the device against a wall or other obstructions close， otherwise it will affect the sound quality and transmission distance . Third， if the parents want headphones or microphones pickup device directly connected to the transmitter， it must be high output ， it can be entered into the transmitter device ， because the receiver is high impedance ( high ) output If the output device is not high ， this emitter is connected ordinary headphones or amp so will reduce certain volume oh. Product of the code Operation Tip: The transmitter and receiver 2 devices simultaneously pressing the M key ， do not let go ， such as two devices are blue lights start flashing rapidly ， then release while waiting indicator light two devices are stopped flashing， shutdown， paired . Please note: non-special device without the need to perform pairing this operation Package Content: 1 X Transmitter 1 X Receiver 2 X Power adapter 2 X USB Cable 2X AUX Cable 1 X User guide(chinese)