Nokia adds low-powered Bluetooth to Windows Phone 8 Lumias
Nokia has brought Bluetooth Low Energy to some Windows Phone 8 Lumia devices. Low-powered Bluetooth is usually used for accessories like heart rate monitors, smart watches and personal activity trackers. At the moment Bluetooth 4.0 is available on Lumia 720, 625, 620 and 520. The upcoming Black release will allow support for all Lumia devices.
Source: CNet Australia