1、Extremely lightweight wireless audio transmitter and receiver, perfect wireless audio solution suitable for all kinds of situations and usages. 2、Transmitter mode: Wireless off‑line flowing from non‑Bluetooth TV, home stereo system or for CD player to Bluetooth headphone or loudspeaker. 3、Receiver mode: Wireless transmission audio from mobile phone support Bluetooth, tablet PC or computer to wired stereo, loudspeaker or headphones. 4、Mode switching: a) If device has been in one mode for a long time, needs to be re‑energized twice to switch to another mode. b) If device has just switched mode, you want to immediately switch to another mode, you just need to re‑energize once. 5、Pairing method: Receiving mode: Pairing name: KN320, find KN320 in Bluetooth settings of the phone to pair. The blue light flashes during the pairing process, and the blue light stops flashing after the pairing is successful. Connect the product to the audio device With 3.5 audio cable. And the red light flashing flashing after pairing succeeding. Product to a device such as TV with 3.5 audio cable/for RCA audio cable. 6、With powerful wireless audio streaming function. Slip this transmitter and receiver into your backpack or laptop bag, carrying around effortlessly. 7、Broad compatibility, with the included 3.5mm cable, this receiver transmitter adapter can widely used on your computer, laptop, home stereo system, headphone, smartphone, Mp3 player, for CD player, etc.