Aperlite YH-500N Flash for Nikon Digital SLR Camera [Supports TTL, Wireless S1 S2 Modes] COMPATIBLE WITH ALL NIKON DSLRS: D3X, D3, D4S, D4, Df, D810, D800, D750, D700, D610, D7500, D7300, D7200, D3300, D3200, etc SUPPORTS TTL, S1 & S2: Automatically compatible with the i-TTL and TTL flash modes of Nikon cameras to provide more accurate metering; supports Nikon 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