GUARANTEE: If you have any issue, please let us know and we will try our best solve your problem. Easy to Use and Mini Size: All-in-one multi-function button designed for easy handling calls and playing music,,moreover,designed with slim body and 3.5mm aux jack, get rid of the tangle cables,saving your space and easy to operate. Dual and Auto Connection: The Bluetooth aux receiver can be paired with 2 devices at the same time,you won't miss any calls while listening to music,meanwhile, it will connected the previous connected device when turn on automatically. Hands-Free Calling: Built-in sensitivity microphone,the Bluetooth aux adapter for car perfectly accepts your voice when you're calling,it also supports voice notification from navigation app,releases your hands that lets you focus on safety driving.Note: Not recommend using it while charging, it may occur noise. The Latest Bluetooth 5.0: This Bluetooth car adapter equipped with Bluetooth 5.0 chip which provides higher speed and more stable transmission and high-quality sound, offers a pleasant sound experience within 33ft steady connection range. Upgrade your Old Stereo: This Bluetooth aux adapter is perfect solution to turn your old non-Bluetooth stereo system into a wireless streaming device like car/home stereo, speakers and wired headphones. Note: It's not Bluetooth transmitter.