Instructions:

1. plug the receiver into the USB port and 3.5MM audio interface;
2. turn on the audio device (adjust the switch to the "LINE" mode)
3. turn on the transmitter (adjust switch to "ON"). Then you will see the Green light of the receiver flash one time. It means the connection is done.

Note: the wireless transmitter is built in high energy polymer battery. If you find the transmitter is decreased sensitivity or reduced distance during using, please turn off the device and to charge. The red light will be on when it's charging and turn off when it's fully charged.
(remember this product can only use 5V power supply or PC USB port)

Technical features: wireless transmission of sound without any delay; realistic sound reduction