Fangrui Product Details 1. T7 4 In 1 Bluetooth 5.0 Usb Transmit Receiving Audio Adapter 2. Input Voltage: Dc 5v 3. Bluetooth Version: 5.0 4. Interface: Usb, 3.5mm 5. Transmission Distance: About 15m 6. Transmission Rate: 100mbps 7. Working Frequency: 2.4mhz 8. Suitable Range: Computer, Tv, Projector (transmitting Mode)speaker, Earphone, Car Machine, Call (receiving Mode) 9. Size: About 4.5x2x1.1 Cm 10. Weight: About 20g 11. Features: 12. Accept Rx+tx Tx Two-in-one Design, Dual-signal One-key Switching, Simple And Convenient To Use, Suitable For A Variety Of Equipment 13. One Key To Answerhang Up A Call, When There Is An Incoming Call In The Receiving Mode, Press The Button To Answer The Call Hands-free 14. Just Plug In The Speaker Or Power Amplifier Interface To Change To Bluetooth In Seconds, Eliminating The Hassle Of Wiring 15. Bluetooth 5.0, Stronger Compatibility, Stable Signal Transmission 16. Driver-free, Plug And Play, Bluetooth Fast Matching Connection, More Convenient To Use