1、WIRELESS FUNCTION: Bluetooth aux receiver wired to wireless, multi device connection, free transmission of sound signals, convert wired sound into wireless signal transmission to wireless devices output. 2、BLUETOOTH 5.3 FUNCTION: Wireless bluetooth sound receiver adopts bluetooth 5.3 chip, stable transmission, fluent and uninterrupted music playback, energy consumption is reduced again. 3、HANDS FREE CALLING: Bluetooth aux receiver built in microphone, hands free amplification clear calls, hands on the wheel, driving safer. 4、HD CD LEVEL SOUND QUALITY: Portable 3.5mm aux car adapter is able to restore high definition sound quality with high resolution, bringing CD level music experience. 5、PLUG AND PLAY: Wireless bluetooth sound receiver is plug and play, convenient and fast, unlimited devices, with 3.5mm sound output or input can be used. Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.