The Nikon SB-700 is a high-performance portable flash with a host of features designed to make flash photography simple, accurate and creative. The SB-700 is for photographers looking for an on-camera Speedlight offering more power for greater depth-of-field control than the built-in flash or for users looking for a compact Speedlight that can be set up as a Commander or a Remote in wireless flash set-ups as well as those who want to upgrade from their existing or older Nikon Speedlight. Flash Coverage:Multi-step auto zoom covers wide 24-120mm zoom range Recycling Time:Approx. 2.5 sec. with NiMH or alkaline batteries, 3.5 s with lithium batteries Number of Flashes:Approx. 160 (Alkaline) 260 (NiMH) Weight (without battery, memory card or body cap): Approx. 360g (14.6 oz.) Other Features:Ready Light, Thermal Cut-out function, Firmware update via compatible DSLR, Hard Color Filters Dimensions:Approx. 71.0 x 126.0 x 104.5 mm Power Requirements,Four AA-size 1.5V batteries.