Transmission mode Infrared-pulse emitting communication using a flash discharge tube Transmission range Approx. 20m (66 ft.) for SB-800/SB-600; Approx 4m (13 ft.) for SB-R200 at normal settings Number of channels 4 Number of groups 3 Number of transmissions per battery Approx. 1200 Transmission interval Approx. 1 second Flash light wavelength Approx. 800 to 1000nm (infrared ray) Flash coverage Approx. 60° Display LCD, ready-light AF-Assist Illuminator Approx. 10m (33 ft.) at center area using a 50mm f/1.8 lens Power source One CR123A (3V) lithium battery Weight (without battery) Approx. 160g (5.6 oz.) Dimensions (W x H x D) Approx. 68 x 96 x 58mm (2.7 x 3.8 x2.3 in.) Included accessory Soft Case (SS-SU800) Optional accessory TTL Cord (SC-30)