Magical Bluetooth USB Adapter for Windows 11/10/8.1/7 OS PC: - The BT542 Bluetooth 5.4 USB dongle can turn Non-Bluetooth PC, Laptop or Desktop into Bluetooth capable, enables wireless function to pair/connect with your Bluetooth headset headphones speaker for streaming stereo music, online talking or Bluetooth keyboard mouse for wireless operation or Bluetooth printers PC Tablet for files photos fast transfer. | Upgraded Latest Bluetooth 5.4 Technology: - The BT542 Bluetooth adapter Applies the latest Bluetooth 5.4technology that backwards compatible with old Bluetooth version V5.3/5.1/5.04.2/4.0/3.0/2.1/2.0/1.1.Supports Dual Modes, BR/EDR and Low Energy Controller. Quick response and better anti-interference, say goodbye to delay and lag. The anti-interference ability has been increased. Enjoy wireless freely, Operate with flexibility and ease. | Plug n Play ONLY for Windows OS System: - Plug and Play to work with Windows 11/10/8.1; Supports Win7 (Driver required for Win7). Please NOTES: 1. It's not compatible with Mac OS, Linux, Car Stereo systems, XBOX or TV. 2. It can’t be used directly on PS3, PS4, PS5, Switch, or Xbox Console; but it works with Game Controllers. | 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. | 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. | Warm TIPS: - BT542 is not compatible with Mac, Linux, TV, Windows 8 or any game console. Please also note that existing internal Bluetooth function needs to be disabled to utilize BT542. Step 1: Go to settings/"Bluetooth & devices" and remove devices you have already paired. Step 2: Go to the device manager (Win + X and select “Device Manager”), expand the Bluetooth section and look for something that says "Radio". Right click on this and select "Disable", then insert the adapter and try again.