Nikon SB-400 Speedlight Compact, lightweight Speedlight unit Simple, intuitive operation; Put it on, turn it on and shoot! 18mm angle of coverage with Nikon DX format digital SLR cameras Utilizes Nikon"s i-TTL intelligent flash Operates on two AA-size (1.5V) batteries Fast 2.5 second recycling time Bounce capabilities in 4 steps up to 90 degrees Approximate guide number of 98.4 feet at ISO 200 (at 18mm zoom head setting) Flash shooting distance range from 2 and up to 66 feet Compatible with all Nikon Creative Lighting System cameras