Description: 【Advanced Technology】: This V5.1 Audio Converter Receiver features V5.1 technology for stronger compatibility. It comes with USB and AUX two outputs, built in stereo microphone, supporting handsfree calls on mobile phones. Please note it cannot be used by plugging into a computer. 【Wide Range of Use】: With a usage distance of up to 10 meters, this Audio Receiver Adapter is great for use in various settings. 【USB Playback Mode】: In USB mode, there's no need for a 3.5 audio cable, simply plug it into your car's USB interface or speaker's USB interface for immediate use after pairing with your phone's function. Please note that the USB playback mode requires support from the car or speaker's USB interface for audio output. 【AUX Playback Mode】: For AUX mode, connect a end of the 3.5 audio cable to the KN318 audio interface and the other end to your car or speaker’s 3.5 audio interface; you can then use it after pairing with your phone’s . 【Handsfree Calls】: The built in microphone allows handsfree calling through KN318, very convenient when driving. Specification: Material: Electronic Components Usage distance: 10 meters Pairing name: KN318 Pairing: blue LED light flashes Pairing successful: blue light stays on Size Chart: 3.2cmx1.7cm/1.26inchx0.67inch Package Includes: 1 Audio Receiver Adapter 1 3.5MM AUX Cable 1 Manual(4 Pack) Note: Please allow slightly errors due to manual measurement and different monitors.