Features: 1. Plug in and enjoy wireless life, four-in-one USB Bluetooth adapter 2. Receive/transmit, two-in-one function 3. Accept RX+transmit TX two-in-one design, dual-signal one-key switching is simple and convenient to use, suitable for multiple devices 4. One key to answer/hang up the call, when you have an incoming call in the receiving mode, press the button to answer the call hands-free 5. Receiving/transmitting-key switch, dual signal and one key switch, can receive and transmit 6. Connect the computer to Bluetooth speakers/earphones, the transmission range can reach 15 meters, enjoy the original music 7. TV, connect the Bluetooth headset, wear the Bluetooth headset, you will not be afraid of affecting your family when you watch a TV in the middle of the night specification: Input voltage: DC/5V Transmission distance: 15 meters Bluetooth version: Bluetooth 5.0 Input interface: 3.5MM audio Driver: No need to install Range of use: This Bluetooth adapter can be used for almost all For digital products with audio input/output (3.5MM audio interface), you only need to connect the audio to the input/output. Package includes: 1pcs/bag (host, 3.5mm audio cable, manual) Plug in and enjoy wireless life, four-in-one USB Bluetooth adapter Receive/transmit, two-in-one function Accept RX+transmit TX two-in-one design, dual-signal one-key switching is simple and convenient to use, suitable for multiple devices One key to answer/hang up the call, when you have an incoming call in the receiving mode, press the button to answer the call hands-free Receiving/transmitting-key switch, dual signal and one key switch, can receive and transmit