Specifications: Model: KN318 Bluetooth-compatible version: BT5.1, A2DP, AVRCP Use distance: 10m Pairing name: KN318 Matching: Blue led light flashing Match successfully: Blue light is always on Product size: 32mm*17mm*8.5mm Features: 1.USB play mode: USB mode does not require the use of 3.5 audio cable. Plug directly into the car USB port or speaker USB port, you can use it directly after pairing with your phone Bluetooth-compatible. 2.AUX play mode: AUX mode requires one end of the 3.5 audio cable to be connected to the kn318 audio interface, and the other end to be connected to the car's 3.5 audio interface or the speaker's 3.5 audio interface, and then can be used after pairing with your phone's Bluetooth-compatible. 3. Bluetooth-compatible hands-free call: Built-in microphone, when the phone is calling, you can make hands-free calls through the microphone on the KN318, very convenient to use in the car. 4. The KN318 is just 32mm (1.26") across and weighs only 3.2g (0.11oz), but has got powerful wireless audio streaming capabilities. has got powerful wireless audio streaming capabilities. With the included 3.5mm cable, this Receiver Transmitter adapter can widely be used on your computer, laptops, 5. With the included 3.5mm cable, this Receiver Transmitter adapter can widely be used on your computer, laptops, home stereo system, headphone, smartphone, Mp3 player, CD player, etc. Note: usb playback mode requires the car USB interface or speaker USB interface to support USB audio output before it can be used. includes: 1x Bluetooth-compatible Audio Receiver 1x 3.5 Audio Cable 1x Manual All Products From Us Have Undergone Strict Quality Checks. If There Is Any Quality Problem Or You Are Not Satisfied With The Product Contact Us. We Will Give You The Best Solution.