Easily attached to the camera via the hot shoe Using of up to 16 channels and 3 groups Setting of different modes: TTL, manual, High Speed Sync, Freeze Mode Radio transmitter with 2.4 GHz Controlling with Rollei App via Bluetooth®) Functions of the app Available for iOS and Android Changing of mode settings such as (TTL/manual), HSS, Freeze etc.) Creating up to 15 set ups