SincereetaliUSB mode does not require a 3.5 audio cable. Plug it directly into the car USB interface or the speaker USB interface, and it can be used directly after pairing with the mobile phone Bluetooth. Note: The USB playback mode can only be used when the car USB interface or the speaker USB interface supports USB audio output. In AUX mode, you need to connect one end of the 3.5 audio cable to the kn318 audio interface, and the other end to the car 3.5 audio interface or the speaker 3.5 audio interface, and then it can be used after pairing with the mobile phone Bluetooth. Built-in microphone, when the mobile phone is talking, you can make hands-free calls through the product microphone, which is very convenient to use in the car. It adopts the appearance of piano baking varnish and the compact and mini body design, the total body length is only 3.2cm. The USB interface of the audio equipment has the function of audio transmission, which can be directly plugged into the USB?; the USB of a small number of devices may be incompatible or delayed, so it needs to be used in conjunction with AUX?! Built-in Bluetooth 5.1 chip, wired to wireless, away from the clutter and constraint of various wires, changing the cumbersome life