Feature s : 1. Durable: 4 hours of battery life, lossless sound quality, hands-free calling, plug and play, AUX interface. 2. Connect to the TV: Connect to the 3.5mm audio interface of the TV, and transmit the sound to the headphones wirelessly, so you can watch movies at night without worrying about disturbing your family. 3. Practical: This product can be connected to the car audio, not only can make calls, but also listen to dynamic music, so that your journey is no longer lonely. 4. Lossless sound quality CD-level enjoyment: High-resolution restoration of lossless sound quality, there is only one CD-level music experience, you can listen to music on your mobile phone. 5. One full charge, 4 hours of use: The built-in rechargeable lithium battery can be charged once, and it can be used for 4 hours when the power is low, which is convenient and worry-free. Descri ption : It can wirelessly connect to the car audio, not only to make calls, but also to listen to dynamic music, so that your journey is no longer lonely. Specification: Item model number: B28 Main functions: Bluetooth-Compatible audio receiver transmitter + call 3.5 audio input 3.5 audio output toggle switch Product color: black Battery capacity: 130Amh (including battery) Working range: 10m (no obstacles) Charging time: 1h Use time: 4h Applicable types: computer, TV, projector (transmitting mode)/speaker, earphone (receiving mode) includes: 1* Audio Receiver (Battery Included) 1* 3.5 Audio Adapter 1* Charging Cable