DESC: Shoe-mount electronic flash for Canon EOS TTL, E-TTL, and E-TTL II cameras Large, full-info, backlit LCD display for controlling and monitoring settings Power zoom-bounce flash head covers 35mm focal lengths (from 24 to 80mm) ISO guide number ranges from 60 at the 24mm zoom-head setting to 120 at 80mm All-silver finish; runs on 2 AA, NiMH, or ni-cad batteries