【V5.1 Noise Reduction】The built-in microphone of the 510 Aux Bluetooth adapter allows hands-free calling while driving. The built-in power isolation module eliminates electricity noise and makes so that your voice is louder and clearer. 【Stereo Music DSP Technology】The Bluetooth car adapter is perfectly compatible with the 3.5mm jack of any car. High quality stereo sound effect makes music more dynamic and enjoyable. This makes the journey more relaxing. 【Very Easy to Use】No more driver, no more adjustment, plug and connect. The multi-function round button of the car Bluetooth receiver allows you to answer/reject/end a call with ease. 【Long Battery Life & USB-C Charging】The Bluetooth adapter for car Axu works for 9 hours after a 2 hour charge. Even more convenient, even while charging, music streaming or calls continue to run smoothly. 【Universal Compatibility】This Bluetooth adapter works as a transmitter with red light for TV, player MP3, airplane, projector, or as a receiver with