【Clear and Crisp Calls】- The 5.1 Bluetooth car auxiliary receiver with built-in microphone allows for hands-free calling while driving. The isolation module eliminates electrical noise for louder, clearer voices. 【Stereo Music with DSP Technology】- Compatible with any 3.5mm car jack, this Bluetooth car auxiliary receiver delivers high-quality stereo sound, making your music more dynamic and enjoyable for a more pleasant journey. 【Easy to Use】- No additional drivers or settings are required—simply plug and play. The multifunctional round button on the Bluetooth car receiver allows you to easily answer, reject, or end calls. 【Long Battery Life & USB-C Charging】- The Bluetooth car auxiliary receiver provides up to 9 hours of playtime after a 2-hour charge. Conveniently, you can continue listening to music or making calls even while charging. 【Universal Compatibility】- This Bluetooth car auxiliary device acts as a red light transmitter for TVs, MP3 players, airplanes, and projectors, or