The Nikon SB-700 AF Speedlight Flash is a portable flash for Nikon digital cameras that is designed to be more powerful than a built-in flash. It can be used as a Commander or Remote in wireless flash set-ups. The SB-700 has a 2.5 second recycle time, which is one second faster than the SB-600. It also has a Guide Number of 28m/92ft (ISO 100, at 35 mm). The SB-700 runs on four AA batteries instead of a Li-ion battery back. -Drawer