Advanced Bluetooth technology 5.0 with transmitter and receiver. Stream the audio output from your TV, CD player, or old PC to wireless headphones, speakers, and even your car stereo system. Premium audio connection and quality with improved connection stability, faster pairing, and lower power consumption for connected devices. Switch between operating and audio connection modes with the push of a button. Enjoy up to 10 hours of operation effortlessly with the larger internal battery and quick charging within 2 hours, ready for many more. Suitable for use in the car as a hands-free device. Feature: built-in battery.