USB Bluetooth 5.0 Wirele Adapter for PC Computer Laptop -Super Mini Size-Support plug and play-Universal USB 3.0 2.0 Port,work stably for a long time.-Supports simultaneous connection of multiple devices.-Bluetooth 5.0 chip,BLE low power.-Compatible with V5.0 V4.2 V4.1 V4.1-Usage for mobile phone,wirele eraphone,headset,gamepad,mouse,keypad,keyboard,printer etc bluetooth devices Note: 1.Only work for Windows (32 and 64bit) System Computer PC,Laptops. Not support MacOS,Linux,Car System,Smart TV System. 2.Use For Bluetooth Devices Connect,Audio/Files Transfer; No Microphone. Files Transfer need Use"Send a file"/"Receive a file"function at first. 3. The transmiion distance is determined by the performance of the receiving and sending devices. Please reduce obstacles between device connections.---Please make sure that your windows computer system has not been modified or streamlined, and the system update function has not been disabled.---Please disable the Built-in Bluetooth Devices of the computer before using this adapter.---If there is no response when the adapter is plugged into the USB port, please try another USB port or try another computer. ---If it still does not work, please contact customer service for additional help. 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 signature Step: 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.