MAIN OVERVIEW FEATURES: Flash Modes: E-TTL,ManualGuide Number: 10.5 m/45.9 ft at ISO 100Flash Range: 16.40 ftLamp Type: LEDNumber of Batteries Supported: 4Battery Size Supported: AABattery Chemistry: Alkaline,Nickel Cadmium (NiCd),Lithium (Li),Nickel Metal Hydride (NiMH)Mount Type: Shoe MountWeight (Approximate): 1 lbCompatibility: Canon Digital SLR CamerasLimited Warranty: 1 Year