Specification:Model: KN318Bluetooth compatible version: BT5.1, A2DP, AVRCPUse distance: 10mPairing name: KN318Matching: blue LED lights flashingSuccessful matching: the blue light is always onProduct size: 32mm*17mm*8.5mmfeature:1. USB playback mode: USB mode does not need to use 3.5 audio cable. Plug directly into the car USB port or the speaker USB port, and it can be used directly after being compatible with the Bluetooth of the mobile phone.2. AUX playback mode: AUX mode needs to connect one end of the 3.5 audio cable to the kn318 audio interface, and the other end to the 3.5 audio interface of the car or the 3.5 audio interface of the speaker, and then it can be used after pairing with the Bluetooth of the mobile phone.3. Bluetooth compatible hands-free call: Built-in microphone, when the phone is talking, you can use the microphone on the KN318 for hands-free calls, which is very convenient to use in the car.4. The KN318 is only 32 mm (1.26 inches) in diameter and weighs only 3.2 grams (0.11 oz), yet packs powerful wireless audio streaming capabilities.With powerful wireless audio streaming capabilities.With the included 3.5mm cable, this receiver transmitter adapter can be widely used in your computer, laptop,5. With the included 3.5mm cable, this receiver transmitter adapter can be widely used with your computer, laptop, home stereo system, earphones, smartphones, Mp3 players, CD players, etc.Note: The USB playback mode requires the car USB interface or speaker USB interface to support USB audio output before it can be used.include:1x Bluetooth compatible audio receiver1 x 3.5 audio cable1x manual