1. Wireless Life Is More Exciting, Multi Functional Aux Bluetooth Player, High Definition Sound Quality, Listening All The Way. 2. Bluetooth 5.3, Long Battery Life, High Definition Sound Quality, Hands Free Calling, Plug And Play, Aux Interface, U Disk Playback, Tf Card Playback, Rx/Tx Mode, Comprehensive Functions, Simple And Practical. 3. Connect To The 3.5mm Audio Interface Of The Tv, And Transmit The Sound To The Earphone Through Bluetooth, So You Don'T Have To Worry About Disturbing Your Family When You Watch Late At Night. 4. Bluetooth 5.3 Does Not Freeze When Listening To , Low Power Consumption, High Speed And Stable Signal Transmission, Smoother And Clearer Transmission Of Listening , More Pleasant Sound Quality, And More Stable Signals. 5. It Can Be Used For 4-8 Hours After A Full Charge. The Built In Rechargeable Lithium Battery Can Be Used For 4-8 Hours. When The Battery Is Low, It Can Be Used While Charging, Which Is Convenient And Worry Free. Transmission Rate: 100(Mbps) Effective Working Radius: 10(M) Bluetooth Standard: 5.3 Working Frequency: 50(Mhz) Colour:black Material:plastic Size: 59 x 44 x 12mm Package Contents: 1 x Wireless Bluetooth Receiver Transmitter 1 x Usb Cable 1 x Chinese And English Manual Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.