Although the manufacturer's website does not indicate that it works with Windows 8.1, it is still the case on my laptop Dell XPS 11 new tone. Attention must do a little manipulation in the device manager if it crashes combined with WiFi. So, Control Panel \ System \ Device Manager \ Bluetooth \ Intel Wireless Card Bluetooth Properties button right click "Change Settings" tab "Power Management" uncheck "Allow the computer to turn off this device to save the energy ". This stuff is from the forum intel "Intel 7260 Dual Band AC + Bluetooth bluetooth not working." It is therefore linked to the bluetooth card. Otherwise it works without doing anything with a USB bluetooth dongle under Windows 7.