Features: 1. Portable, lightweight wireless audio transmitter and receiver. Ideal for wireless audio solutions in a variety of situations and applications. 2. Transmitter. Wirelessly transfer audio from a TV, home stereo system or CD player that have no function for Bluetooth to a headset or speaker that support for Bluetooth. 3. Receiver. Wirelessly transfer audio from mobile phones, tablets or computers that support for Bluetooth to cable stereo, speakers or headphones. 4. Mode switching. If the device is in a certain mode for a long time, it needs to be powered on twice to switch to another mode. If the device has just switched modes and you want to switch to another mode immediately, you only need to reactivate it once. 5. Pairing method. RX mode: Pairing name: ZF-169, find it in the settings for Bluetooth of the phone. The blue light flashes during the pairing process, and the blue light stops flashing after the pairing is successful. Connect the product to an audio device using a 3.5 audio cable. 6. Send mode: The send mode will automatically search for other receiving devices for Bluetooth (such as headset, speaker, receiver, etc.). When pairing, the red light will flash. After the pairing is successful, the red light will stop flashing. Connect the product to a device such as a TV using a 3.5 audio cable / RCA audio cable. 7. Ultra-portable audio streaming power supply. The KN320 is only 18mm/0.63in and weighs only 18g/0.63in, but has a powerful wireless audio streaming function. Put this transmitter and receiver in your backpack or laptop bag and use it anytime, anywhere, without any effort. 8. Wide compatibility. With 3.5mm cable, this receiver transmitter adapter can be widely used in your computer, laptop, home stereo system, headset, smart phone, Mp3 player, CD player and so on. Specifications: Color: black Material: ABS for Bluetooth: Jerry 5.0 + EDR Interface: 3.5mm/USB Distance: 10m barrier-free Power supply: USB powered (no internal battery) Size: Approx. 32*17*8.5mm/1.26*0.67*0.33in Weight: 3.5g Package Size: Approx. 68*16*67mm/2.68*0.63*2.64in Machine: 18g Package List: 1 * Receiver Tansmitter 1 * Audio Cable