Extra-Long Play/Talk TimeBluetooth 5.0 cassette adapter advanced chip power supply is more stable, faster transmission speed, lower power consumption. The built in lithium ion batteries provides up to 8 hours of playback and talk time, and can be fully charged in 1.5 hours. When the adapter is charging. The red light turns blue to indicate that the charge is full.Answer Calls with One KeyThe Bluetooth Cassette Adapter also has wide compatibility with all Bluetooth enabled devices, such as Android and IOS SmartPhones, MP3 Player, Tablet; Also it will fit all of cars/trucks that have cassette player.This tape converter has a built-in microphone and is equipped with a call button. Hands-free call is possible.You can answer a call with one key on the handset of the Bluetooth tape adapter.Press once to connect the call, press again to hang up the call.What You Will Get1 Pack of Bluetooth 5.0 Receiver Cassette Adapter, Product Manual and 1 USB Charging Cable. After receiving the goods, if you are not satisfied, please feel free to contact customer service. We will try our best to solve any problem for you.Cassette To Aux AdapterThis bluetooth 5.0 Cassette Aux adapter is compatible with most smartphones and is ideal choice for home or car audio systems. You don't need to modify the car's original classic!It's a cheapest and easiest way to use than replacing a whole radio.Tape audio adapterThis smart cassette player adapter is equipped with a stereo two-channel audio transmitter to achieve stereo surround, which can effectively improve the playback quality. Just turn on your phone's bluetooth and adapter connections, adjust the audio balance settings, and you're ready for classic music!