You can pair all kinds of Bluetooth devices with your Surface Duo—including speakers, headphones, earbuds, keyboards, mice, and more. After that, you can use these Bluetooth accessories with your Surface Duo.
Swipe down from the top of the screen, then tap and hold Bluetooth in quick settings.
On the Connected devices screen, tap Pair new device.
Turn on your Bluetooth device and make it discoverable. The way you make it discoverable depends on the device. Check the device or visit the manufacturer's website to learn how.
Tap the name of your Bluetooth device to pair it with your Surface Duo.
Some Bluetooth devices support Fast Pair, which let you quickly connect by tapping a notification that appears.
For more info about connecting to Bluetooth devices, see Connect through Bluetooth on your Android device on the Android Help site.