Bluetooth-compatible 51 Audio Receiver Dual Output AUX USB Stereo Car Hands-free Call Built-in Wireless Microphone Mic Adapter Features: _x000D_ _x000D_ _x000D_ The usb mode does not need to use 3.5 audio cables. It can be directly plugged into the car usb interface and speaker usb interface, and can be used directly after pairing with the mobile phone.. _x000D_ The car usb interface and speaker usb interface must support usb audio output. _x000D_ AUX Mode requires that one end of the 3.5 audio cable be connected to the kn318 audio interface, and the other end be connected to the car 3.5 audio interface and speaker 3.5 audio interface. _x000D_ It can be used after pairing with the Bluetooth of the phone,but cannot be used on Computer. _x000D_ Built-in microphone allows you to make hands-free calls through the microphone on the KN318 when making phone calls, making it very convenient to use in the car. _x000D_ _x000D_ _x000D_ _x000D_ _x000D_ _x000D_ Specifications: _x000D_ _x000D_ _x000D_ _x000D_ Technologies: BT5.1, A2DP, AVRCP _x000D_ Operation Range: Up to 10m / 33ft _x000D_ Pairing name:KN318 _x000D_ Pairing: blue LED flashing _x000D_ Paired successfully: The blue light keeps on _x000D_ Size: As Picture _x000D_ Color:As Picture _x000D_ _x000D_ _x000D_ _x000D_ _x000D_ _x000D_ Package Includes: _x000D_ _x000D_ _x000D_ _x000D_ 1Pc x Bluetooth 5.1 Audio Receiver Adapter _x000D_ 1Pc x 3.5mm Aux Cable _x000D_ 1Pc x User Manual _x000D_ _x000D_ _x000D_ _x000D_ _x000D_ _x000D_ Note: _x000D_ _x000D_ _x000D_ _x000D_ Please allow 1-3cm differences due to manual measurement. _x000D_ Due to the difference between different monitors,the picture may not reflect the actual color of the item.Thank you! _x000D_ _x000D_ _x000D_ _x000D_ No Retail Box,Packing Safely in Bubble Bag. _x000D_ _x000D_ _x000D_ _x000D_