Hand Free Calling A built-in microphone ,Just press the button to answer or hang up your phone calls while driving. You dont have to look down the phone on the move. Make sure you drive safely! Plug and play No need to drive and download APP, Bluetooth receiver just plug it in the aux port, turn on Bluetooth on your mobile, connect and play. Simple human-computer interaction operation, the operation is more convenient. Lossless Sound QualityOur aux bluetooth receiver adopts the Intelligent noise cancellation, providing you with crystal-clear calling sounds. And provide more stable & faster transmission with less power consumption, which can represent a superior audio performance to spoil your ear and never feeling boring while driving. Wireless Music ReceiverThis Bluetooth 5.0 Receiver can Stream music from phones, computers, PDAs and other digital products to home sound audio system or car stereo system. Upgrade your car or home audio to Bluetooth audio, listen to music wirelessly. Wide compatibility Bluetooth aux adapter is 3.5MM audio output interface design, flexible and more versatile, compatible with most smartphones, ideal for home or vehicle audio systems.