The SP692C features an impressive Guide Number of 50 m/164 ft. (at ISO 100 at 180mm focal length) with 22 levels of output adjustments (1/1 to 1/128th) in full- or 1/3-stop increments. It also allows for exposure compensation from -3 to +3. Recycling times are from 2 seconds (with AA Ni-Mh batteries) to 5 seconds (with AA alkalines) with flash duration times from 1/800 to 1/20,000 sec. However, in Multi (Stroboscopic) mode it is capable of firing repeatedly during a single exposure creating multiple exposure effects. A thermal cut-out feature offers protection against overheating. Other features include power-zoom function that automatically adjusts the zoom position to match the lens focal length between 24mm and 180mm. For additional lighting control, the SP692 features a tilting and rotating head that offers vertical rotation from -7? to 90? and horizontal rotation from 0? to 270?. A built-in bounce card and wide panel provide extra light control in special situations. An AF assist beam emitter will help your camera focus in low-light situations. Another advanced feature is the SP692?s front-curtain/rear-curtain sync options, which allow you to produce special effects when shooting moving subjects. All controls are conveniently located on the rear of the flash, with a bright LCD panel that provides all critical information, shooting modes and settings. The SP692 is powered by four AA-size batteries (sold separately) and will accept an external power source or a PC sync cord. A power-saving feature shuts the unit off after three minutes. It measures 7.75 x 3 x 2.3" and weighs 15.2 oz. Note: The SP692 is not compatible with the Canon EOS Rebel T4i.