[Bluetooth receiving mode] In the mode, insert a non-Bluetooth device through the AUX to make the non-Bluetooth device emit sound. Such as car speakers/home video/old fashion speakers/wired headphones without bluetooth, make non-bluetooth devices receive bluetooth signals from your phone. Simply connect the Bluetooth transmitter to your old device and enjoy hands-free calling and HD quality wireless music. [Upgrade Bluetooth 5.3 for clearer sound] The Bluetooth transmitter receiver 2 in 1 is equipped with the latest Bluetooth 5.3 technology, which optimizes the transmission delay and connection defect problems of the old Bluetooth 5.0. Bluetooth 5.3 adapter will bring you a faster, more stable and smarter connection with less loss of sound quality. Up to working distance, enough for daily use. [Innovative LED Digital Display] Another unique feature of this portable Bluetooth stereo adapter is LED screen. On it, know the current status of functions such as volume level and accurate battery charge. It can remind us to recharge in time, so that without interruption. [Enhanced Dual Microphones] Dual microphones work to your voice from all directions, and the upgraded 8.0 noise reduction technology blocks out more road noise, wind noise and other distractions. This ensures that both you and the caller can be heard clearly. Simply press the call button and enjoy hands-free calls . [Multiple security protection] Bluetooth adapter strictly follows quality standards. Full metal shell, anti-fall and wear-resistant. The button design makes driving , and it is easy to control music playback, pause, /reject calls. The Bluetooth AUX adapter has built-in withstand voltage protection, overcurrent protection, short circuit protection, and NTC overheat protection. Keep equipment safe. Colour:Photo Color Material:plastic Size:1.65x0.59x1.89inches Package Contents: 1 x Bluetooth Adapter Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.