IMPORTANT NOTES:1. If there is built-in or 3rd Bluetooth into the PC, please be sure to disable all existing Bluetooth devices in "Device Manager" at first, then insert the adapter and try again. 2. If you have any question about the driver installation or product usage, you can contact our reliable customer service via Amazon Message or refer to the user manual included in the product for help.More Stable, Faster Speed, Further Coverage: - This Bluetooth dongle is equipped with Bluetooth 5.4 + EDR, Improves the stability of the connection, Gets faster data transfer speeds of up to 3 Mbps, which is double what Bluetooth 4.2 supports, Utilizes Bluetooth low energy technology for energy-saving wireless connectivity. Extended range of transmission distance up to 66ft/20M in open space.*NOTE: Operation range can be affected by Wi-Fi routers, Wireless TV adapters, physical obstructions like walls, metal obstacles etc. and also depended on Bluetooth receiving device.Plug & Play: This Bluetooth adapter is Plug & Play for Win8.1/10/11, just plug the USB wireless adapter into your computer, you can use it directly. Not limited by network and location. You can use the Bluetooth function anytime and anywhere. Greatly improve your work efficiency and save your time. (Please disabled all the existing Bluetooth function firstly. Not applicable to Mac OS, TV, Car Radio or Microsoft)Stream Music, Talk Calls, Broad Application: - BT542Bluetooth USB adaptor converter for PC connects with Bluetooth headset headphones or speakers for stereo music wireless streaming. Also, you have the ability to take Skype or phone calls using your headset mic and use the USB adapter to transfer data files to / from mobile phones / tablets.Reliable Compatibility, 5 Devices Sync Connected: - BT542 Bluetooth 5.4 dongle for PC Laptop supports up to 5 devices to be connected and can work together at the same time without interfering with each other, Which means that you can listen to high-quality music while using the keyboard or other devices. But If Bluetooth audio devices of the same type (such as speakers/headphones) are connected, only one device can play music