■ All-Weather & Marine electronic flash  　for digital and film cameras. Photography for marine locations, winter sports as well as construction sites and public works. G-Flash is designed to take flash pictures confidently in any weather at construction sites, marine locations, even in a downpour or any environment of dust, sand, rain, snow or other harsh elements. This is wireless type with pre-flash cancellation, which is triggered by the camera's built-in flash and no required any connection cord Description of Parts & LCD Display GN22(ISO100) developing photography distance greatly It carries out simultaneous flash with the built-in flash of a camera, and can take photo subject to about 8m. *1 *1 : It is based on the conditions of a built-in flash GN8 of ISO100-m and the aperture of 2.8. ontinuous variable flash output control (GN22-3)  Flash output control knob Wireless triggering by means of high-sensitivity slave trigger.*2 Slave Sensor Wireless synchronization with built-in camera flash and no required connection cord. Can be triggered at the remote location from the subject by means of high-sensitivity slave trigger. *2 When there is no subject in which reflects the light of built-in flash, a sensor may not react. Pre-flash cancellation function*3,is equivalent to the Pre-flash system of digital camera. *3 There is a type of digital cameras with which a built-in flash fires twice. The first flash is for flash control and a photograph is taken by the 2nd flash. A Pre-flash cancellation is a function to synchronize with the 2nd flash without reacting to 1st Pre-flash. Water resistant and sealed against dust to JIS protection grade 8. Easy to mount on a camera with attached bracket. Covers the field of a 28mm lens on the 35mm format without noticeable light falloff. with wide angle adapter Attaching the included wide-angle panel on the flash head allows you shoot with ultra wide-angle lenses down to 20mm. Guide Number 22m/73ft (ISO.100-m) (28mm) Recycling Time *Full flashing Alkaline  Battery 2-AA Alkaline batteries approx. 9.0 sec. Ni-MH  Battery 2-AA Ni-MH batteries approx. 7.5 sec. No. of Flashes *Full flashing Alkaline  Battery 2-AA Alkaline batteries approx. 150 Ni-MH  Battery 2-AA Ni-MH batteries approx. 230 Function Slave function with pre-flash cancellation Power Ratio (Manual) GN22 - 3 continuously variable flash control Flash coverage The focal length of 28mm or more is covered (with 135mm cameras) Waterproof ability The 8th class of JIS C0920 protection grade Water pressure-proof 45m(148ft) Dimensions(H x W x D) 70 x 70 x 105mm for main body　120 x 193 x 35mm for bracket Gross weight 284g main body (without battery) 183g bracket JAN Code No. 4960436023577 ■external flash ■Not using