Aperlite YH-500C Professional Flash for Canon Digital SLR Camera, Supports TTL, Wireless S1 S2 Modes COMPATIBLE WITH ALL CANON DSLRS: EOS 1D X, EOS 5D Mark III, EOS 5D Mark II, EOS 6D, EOS 7D Mark II, EOS 7D, EOS 70D, EOS 60D, EOS Rebel T5i (700D), EOS Rebel T3i (600D), EOS Rebel T2i (550D), etc SUPPORTS TTL, S1 & S2: Automatically compatible with the E-TTL II, E-TTL and TTL flash modes of Canon cameras to provide more accurate metering; supports Canon wireless S1 & S2 modes GN 58: Features a maximum guide number of 58 at ISO 100; 8 levels of output control & 22 levels of fine tuning; covers a focal length range of 24mm to 105mm to suit various photography needs FAST RECYCLE SYSTEM: Takes only 3 seconds for the flash to be fully charged after a full-level output; powered by 4 AA batteries; battery life: 100-1500 flashes HIGH PERFORMANCE: Supports automatic focus function, automatic / manual zooming, exposure compensation and front curtain synchronization