Product Name: Bluetooth-compatible Receiver Model: RTL812 Interface: USB Whether Plug And Play: Yes Transmission Rate: 3(Mbps) Effective Working Radius: 20(m) Bluetooth-compatible Standard: 5.3 Working Frequency: 2.4(MHz) Specifications: 1. The Latest Bluetooth-compatible 5.3 Technology Is Used To Effectively Enhance The Anti-interference Ability And Greatly Reduce The Delay. Fast Response Speed, More Stable Connection, Better Anti-interference Ability, Say Goodbye To Delay And Lag. 2. Simple Operation, Plug And Play, More Convenient To Use. 3. Support Up To 5 Devices To Connect At The Same Time Without Interfering With Each Other, Which Means You Can Listen To High-quality Music While Using The Keyboard Or Other Devices. 4. The Low-profile Compact Small USB Adapter Allows You To Leave Plugged Into Your Laptop Or PC Without Blocking Or Interfering With The Surrounding USB Ports. Package Included: 1 *(1 Bluetooth-compatible Receiver)