ProMaster 200SL Speedlight for Canon Digital EOS, Black (4646) Guide Number: 60 Compatible with all Canon EOS digital cameras Built in wireless slave function with 4 channels in 3 groups Uses (4) AA batteries (not included) Flash Coverage: 24 - 180mm (18mm with wide panel) Flash Duration:1/800  1/20,000 second Color Temperature:5600 k Flash Coverage:24  180mm Bounce Position:7, 0, 45, 60, 75, 90 Guide Number:197&#039; (60 m) at ISO 100 Swivel Position:Left 0  90 | Right 0  180 Recycling Time @ Full Power:3 Seconds Power Source:AA alkaline or NiMH Fits camera brand:Canon Master Slave Mode:Optical pulse with 3 groups, 4 channels Width:3&#034; Height:7.75&#034; Depth:2.3&#034; Weight:0.93 lbs Width:4.6&#034; Height:10.5&#034; Depth:4.6&#034; Weight:1.8 lbs