Features: Up to 8 Hours of Battery Life:The working time of this aux bluetooth-compatible receiver is up to 16 hours when making calls or playing music. And it takes only 2 hours to fully charge the device by using a Type-C fast charging cable. Hands-free Calling:A built-in microphone and one button to answer / redial / hang up / reject calls help you make hands-free calls. And the bluetooth-compatible adapter for car supports broadcasting voice notification from existed navigation App. You don't have to look down the phone on the move. Make sure you drive safely! Receiving Mode Car Connection: The car speaker plugs and plays in a few seconds becomes a Bluetooth-compatible speaker and is automatically connected back. Enjoy mobile music and HD voice navigation broadcast. HD Sound Quality: Clear call without noise built-in microphone support CVC call noise reduction technology one-button no-improve call clearing stable transmission no delay and no delay. Suitable for: Connecting the car audio restore the beautiful sound quality support SBC/AAC HD audio decoding clearly restore the music details all the way to listen to the sound. Specifications: Material:ABS Effective Working Radius: 20(m) Bluetooth-compatible Standard: 3.0 Size:5.3*2.5*1.1cm includes: 1 *Aux to Bluetooth-compatible Receiver 1*Usb Cable "