Currently, only certain Macs support Bluetooth discovery. This is not yet supported on Windows.
Bluetooth discovery allows devices to see each other even when they may be on different subnets or when Bonjour and mDNS traffic isn't available. It is important to note that Bluetooth is only available for discovery. You cannot connect to a device if it isn't on the same network.
To use Bluetooth discovery both devices need to be in the range of each other. The maximum Bluetooth range varies, but on average is about 30 feet.
When AirParrot sees an Apple TV with Bluetooth enabled, it will show this icon
Click the icon and mirroring should begin.
Your Mac will need to be equipped with a Bluetooth LE chipset also. To find out if your Mac has this chipset follow the instruction below:
Determine your Mac's Bluetooth version by clicking the icon in the top-left of your menu bar
Select About This Mac
Click on the More Info... button
Click on the System Report... button
Select Bluetooth from the sidebar on the left, underneath "Hardware"
Scan down the list of information until you find "LMP Version"
If your Mac is equipped with Bluetooth 4.0, LMP Version will say 0x6. Anything lower than that is an older version of Bluetooth.