Features: Long Working Time:Aux adapter Bluetooth-compatible car kit for cars can work for up to 8-9 hours when making calls or playing music equipped with a USB-C fast charging cable in the package fully charged in about 2-2.5 hours. Safety Hands-Free Calling:Built-in microphone for answering calls set free your hands allows you to drive safely and conveniently. High Definition Sound Quality: Clear call without noise built-in microphone support CVC call noise reduction technology one button hands-free high-definition call stable transmission no delay and no jamming. Wide Compatibility:Bluetooth-compatible wireless music receiver compatible with most smart phones ideal for home or vehicle audio systems. The car aux adapter has low latency and dual link connectivity wirelessly connecting your life. 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. Specifications: Material:ABS Effective Working Radius: 10(m) Bluetooth-compatible Standard: 4.0 Size:5.5*2*1cm includes: 1 *Aux to Bluetooth-compatible Receiver 1*Usb Cable "