MINI USB Bluetooth 5.0 Adapter Wirele Bluetooth Transmitter for PC Computer Laptop -Super Mini Size-Install the driver to ensure more stable operation.Driver download link and installation instructions are provided with the package.-Universal USB 3.0 2.0 Port,work stably for a long time.-Supports pairing of multiple devices(Only support one audio device at the same time).-Bluetooth 5.0 chip(RTL8761),BLE low power.-Compatible with V4.2 V4.1 V4.1-Usage for mobile phone,wirele eraphone,headset,gamepad,mouse,keypad,keyboard,printer etc bluetooth device Notice: 1.Only work for Windows (32 and 64bit) System Computer PC,Laptops. 2.Use For Bluetooth Devices Connect,Audio/Files Transfer; No Microphone. 3. The transmiion distance is determined by the performance of the receiving and sending devices. FAQ1:Realtek Bluetooth is not ntalld on your system. Step1.Your computer already has other Bluetooth devices.Step2.Disable it.(This Pc-Right Click-Manage-Device Manager-Your old bluetooth-Disable Device)Step3.re-install the driver. FAQ2:An exclamation mark appears on the Bluetooth adapter and the device cannot be connected. Disable windows10 signatureStep:1. Pre the key combination "Win + I" to enter "all settings"2. Find and enter "update and security" in "all settings"3. Find "restore" and click "restart now" under "Advanced startup" to restart the computer.4. After restart, select "troubleshooting", select "advanced options", select "startup settings", and click "restart".5. Enter "7" as prompted to disable driver forced signature.