T7 4 In 1 Bluetooth 5.0 USB Transmit Receiving Audio Adapter 1. Input voltage: DC 5V 2. Bluetooth version: 5.0 3. Interface: USB, 3.5mm 4. Transmission distance: about 15m 5. Transmission rate: 100Mbps 6. Working frequency: 2.4MHz 7. Suitable range: computer, TV, projector (transmitting mode)speaker, earphone, car machine, call (receiving mode) 8. Size: about 4.5x2x1.1 cm 9. Weight: about 20g Features: 1. Accept RX+TX TX two-in-one design, dual-signal one-key switching, simple and convenient to use, suitable for a variety of equipment 2. 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 3. Just plug in the speaker or power amplifier interface to change to Bluetooth in seconds, eliminating the hassle of wiring 4. Bluetooth 5.0, stronger compatibility, stable signal transmission 5. Driver-free, plug and play, Bluetooth fast matching connection, more convenient to use