This car Bluetooth adapter can be connected to non-Bluetooth car audio systems, home stereos, speakers, wired headphones via the 3.5mm AUX adapter; And equipped with a Bluetooth 5.0 chip for stable connection / fast transmission / wide signal range. Just pair it with your phone and start listening to your favorite music! This Bluetooth audio receiver adopts the latest CVC8.0 Noise Cancellation and Digital Signal Processor (DSP) technologies, which can eliminate echo and block out intrusive background noise (such as wind, traffic, or crowds), providing you with crystal-clear calling sounds. The working time of this aux Bluetooth adapter is up to 16 hours when making calls or playing music. A built-in microphone and one "MFB" button to answer / redial / hang up / reject calls, help you make hands-free calls. The portable Bluetooth stereo adapter can be paired with 2 devices at the same time.