KN318 USB Bluetooth 5.1 Adapter Audio Receiver Features: 1. Built-in microphone, support Bluetooth hands-free call 2. USB mode does not need to use 3.5mm audio cable, directly plug into the car USB port or speaker USB port, you can use it directly after pairing with the mobile phone Bluetooth 3. In AUX mode, you need to connect one end of the 3.5mm audio cable to the audio interface of this product, and the other end to the 3.5mm audio interface of the car or the 3.5mm audio interface of the speaker, and then it can be used after pairing with the Bluetooth of the mobile phone. 4. USB DC 5V interface power supply, support multiple power supply methods 5. Small size, easy to carry Notice: USB mode can only be used when the car USB port or speaker USB port supports USB audio output Product specifications: 1. Bluetooth version: BT5.1, A2DP, AVRCP 2. Bluetooth distance: 10m 3. Pairing: the blue LED light flashes 4. Pairing is successful: the blue light keeps on 5. Power supply mode: USB power supply 6. Product size: 32x17x8.5mm Packing list: Bluetooth audio receiver x 1 3.5mm audio cable x 1 Manual x 1