- Circuit design : Insulated Gate Bipolar Transistor ( IGBT ) - Guide Number : 58 meters ( ISO 100, 105 mm ) - Flash Mode : E-TTL/Manual/ Multi/ Front-curtain sync/ S1/ S2 - Power Zoom function : covered focal length range from 24 to 105mm - Wireless triggering distance : 20 ~ 30m indoor, 10 ~ 15m outdoor - Vertical Rotation Angle : 0 ~ 90 degrees - Horizontal Rotation Angle : 0 ~ 270 degrees - Power Supply : 4 x AA ( Alkaline or Ni-MH are useable ) - Lighting Times : 100 ~ 1500 times ( AA Alkaline cell used ) - Recycle Times : approx 3 sec. ( AA Alkaline cell used ) - Color Temperature : 5600k - Flash Time : 1/500s ~ 1/20000s - Flash Control : 8 levels of output contrExternal Interface : hot shoe, PC port and external charging port - Additional Features : sound indicator, PC port, power saving mode, over heat protection - For Canon Dan Nikon