Long Working Time: Fully charged once and used for 4 hours: the built-in rechargeable lithium battery can be charged once, and can be used for 4 hours when the battery is low, which is convenient and worry-free.Noise Cancellation: CVC8.0 Noise Cancellation and DSP technologies eliminate echo and block out intrusive background noise and create lossless audio CD-class quality music,whether in the vehicle or home audio, you can bring you a lossless music experience.2-in-1 Bluetooth Audio Adapter: Transmitting and Receiving mode via slide the right button to easily switch the mode. At the transmitting mode, plug the 3.5mm audio cord into your TV/Laptop/computer/projectors aux jack, transmitting the sound to you wireless headset. At the receiving mode, plug the converter into the car audio/ speaker /home stereo make music more louder, then enjoy the music auditory feast.Plug and Play: You only need to insert the Bluetooth transmitter into 3.5mm audio holes to enjoy non -destructive music, no additional driver is required. Exempt calls and navigator voice by built -in microphone make your driving safer.Bluetooth 5.0: Use Bluetooth 5.0 chip to ensure instant pairing and maintain strong and stable wireless connection. Low power consumption, high transmission speed and stable signal make it smoother when listening to the song. Enjoy a new music experience at any time.