Specifications: Using bluetooth-compatible 5.0 technology, it has hands-free call function and can plug and play. Bluetooth transmission mode (TX) means to convert wired audio into bluetooth-compatible signal and transmit it to the bluetooth-compatible device for output. The bluetooth-compatible receiving mode (RX) refers to receiving bluetooth-compatible signals and transmitting them to wired audio through the bluetooth-compatible connection. Just connect to the 3.5mm audio interface of the TV, and then you can transmit the sound to the headset by Bluetooth, so you are not afraid to disturb your family when you watch a movie at night. Connect the bluetooth-compatible connector to the car audio interface through the adapter or transmission cable(standard), and connect the bluetooth-compatible to the car stereo, you can not only make calls, but also listen to dynamic music. With high-resolution restoration of lossless sound quality, you can listen to music on your phone. The built-in rechargeable battery can be charged once, and it can be used for 4 hours when the battery is low, which is more convenient and safer. With low power consumption and high rate stable signal transmission, let you listen to songs more smoothly. Item Name: bluetooth-compatible Audio Adapter Material: ABS Product Model: C28 Battery Capacity: 140Amh(Included) Working Range: 10m(without Obstacles) Charging Time: 1H Use Time: 4H Applicable Type: Computer, TV, Projector(Transmission Mode) or Speaker, Earphone(Receiving Mode) Features: Hands-Free Call, Plug and Play, Low Power Consumption, Stable Signal Transmission Size: 5.95cm x 2.2cm x 1.2cm or 2.34" x 0.87" x 0.47" (Approx.) Notes: Due to the light and screen setting difference, the itemand 39 s color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Package Includes: 1 x bluetooth-compatible Audio Adapter 1 x Charging Cable 1 x User Manual 1 x 3.5mm Audio Cable Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.