The 2800 Electronic Flash has two automatic power settings, an exposure verification indicator, an adjustable bounce head for soft lighting effects, and energy-saving thyristor circuitry for faster recycling and longer battery life. While most camera's built-in flash units are only effective from a distance of 8 to 12 feet, the 2800 gives you the freedom to be more than four times farther away. With this much additional flash power, it's like having a bolt of lightning at your command. >>> The Sunpak Digital Slave Grip has a comfortable contoured hand-grip with quick-release camera platform and enables the use of an auxillary flash as a wireless remote "slave" to complement the camera's built-in flash. It can even be used off-camera with an auxillary flash as a remote slave for more professional and creative lighting effects. Most digital cameras emit a "pre-flash" and/or a "red-eye" pulse that fires before the shutter opens, then an additional flash pulse is fired to actually light your picture. This "pre-flash" ("double-flash") or "red-eye" pulse confuses other non-digital flash and slave units, causing them to go off at the wrong time, and are therefore useless for your digital camera. But the advanced pulse-counting digital circuitry of the Sunpak Digital Slave Grip is not fooled by the "pre-flash" and also eliminates the need for an electrical connection to your camera. The Digital Slave Grip has five LED-indicated pulse counting/delay variations allowing it to ignore "pre-flashes" and fire the High Power 2800 Flash at the precise moment your camera requires. Set it up with your camera's built-in flash just once using our included easy-to-follow step-by-step directions and you are all set for noticeably better flash pictures from that moment on. The 2800 Flash and the Digital Slave Grip require 8 - AA batteries: 4 for the Flash and 4 for the Digital Slave Grip which are included in this kit, along with a padded case, NiMH Charger, and Cleaning Kit.