[Support Non-Bluetooth Audio Device] This Bluetooth audio receiver can be connected to non-Bluetooth audio device through 3.5mm aux adapter, like car radio, stereo channel , wired headphones, etc. Just pair it with your phone and start listening to your favorite music! [Hands-free calling] Built-in microphone and "Mfb" button help you answer/re-answer/hang up/decline calls and allow you to have hands-free calls. The Bluetooth adapter can be paired with both devices at the same time, then you can easily switch between devices to make a phone call or play music. [Bluetooth 5.0 and autoconnect ] is equipped with Bluetooth 5.0 chip for stable connection / fast transmission / wide signal range. Once paired, in-car receivers will automatically reconnect to the last paired Bluetooth devices, provided they are within wireless range. [Advanced Noise Reduction Technology] With the latest noise reduction technology CVC 8.0 noise and Digital Signal Processor (DSP) technology, the Bluetooth jack adapter provides clear audio for your calls. [Long Battery Life] Up to 16 hours after full charge. The Type-C fast charging cable (included in the package) can be fully charged in 2.5 hours.