Untitled 1The PROMASTER 100SL for Canon sports a full complement of advanced features in a small form factor. Its hybrid design gives you the option of an LED light for videos or flash for still photos. The 100SL is well-balanced so it 'just feels right' on your camera while throwing a flattering quality of light towards your subject. Use it in a wireless flash system as a master or slave unit. You can even use the 100SL to remotely fire your cameraThe 100SL for Canon features include:LED light for videographyRemote camera triggeringSwivel and bounce22 levels of light output controlHSS high-speed syncThermal cut-off protectionQuick release camera connectionWireless Master/Slave TTL functionality1st and 2nd curtain syncStroboscopic modeFlash exposure bracketingGuide number: 100 (100' / 30 m at extended/50 mm reflector position, ISO 100)Bounce positions: 0o, 60o, 75o, 90oSwivel positions: Right 0o - 90o; Left 0o - 180oFlash coverage: 24 - 50 mm (manual)Flash duration: 1/800 - 1/20,000 secondColor temperature: 5600 KExposure compensation: +/- 3 EV in 1/3 EV incrementsMaster/Slave mode: Optical pulse with 3 groups, 4 channelsRecycling time: Alkaline cells 0.27 - 5 seconds; NiMH cells 0.15 - 2 secondsDimensions: 5 1/2" x 2 3/4" x 2" / 140 mm x 70 mm x 50 mmWeight: 9 3/4 oz / 27 g (without batteries)Power source: 4 x 1.5 V AA alkaline batteries or 4 x 1.2 V NiMH batteries