Σχετικά με το led
LED notifications feature is /will be included in future builds of Windows 10. This feature will only be available to those who own a smartphone that has a hardware LED integrated like the Lumia 730, Lumia 735 and Lumia 930.
από υπάλληλο της ms εδώ:
http://answers.microsoft.com/en-us/insider/forum/insider_wintp-insider_devices/led-notification-in-lumia-730/8f231cd9-e45c-4dbe-9359-d3be63436c6b