Key FeaturesManual and TTL Control of AirTTL FlashesManual Control of Air FlashesCompatible with Canon E-TTL / E-TTL IIRange: 1000' (Normal) / 330' (TTL)8 Channels; 3 GroupsHigh-Speed Sync up to 1/8000 SecondNine Stops of Manual Power Control±2 EV of TTL Power Ratio ControlTurn On/Off Modeling Light..