Frequency band: 2.4 GHz No. of frequency channels: 8 No. of remote/TTL control groups per: 3(A-C) Operation modes: TTL & Manual TTL camera compatibility: Canon E-TTL II Wireless Range: Normal sync up to 300 m *1ooft) Remote control and TTL sync up to 100 Meters (330 ft) Battery type: 2xAAA (Alkaline) Typical battery lifetime: 30 hours Antenna type: Integrated Auto power off: Yes, 30 min of inactivity Camera mount/Sync in: Canon hot shoe only FW upgrade: USB Mini Sync/Trigger: Yes, triggers Air Remote & Air Sync transceivers plus all Profoto flashes with AirS, Air or AirTTL support. Remote control: Yes, TTL group control for all Profoto flashes with Air or AirTTL support. TTL control: Yes, TTL group control for all Profoto flashes with AirTTL support Dimensions: 75x60x35mm (2.9x2.3x1.4 inch) Weight: 75g (2.5 oz) including batteries