Features : Electronic Construction : Automatic Insulated Gate Bipolar Transistor (IGBT) and series circuitry Flash Exposure Control : TTL automatic control with Nikon F5, F100, F80, F75, and FM3A; Manual control; i-TTL Balanced Fill-Flash with Nikon D2X, D2Hs, D70, F6; D-TTL Balanced Fill-Flash with Nikon D1, D2 series or D100 Guide Number : Approx. 30/98 (at 35mm setting) at ISO 100 Flash Coverage : Automatic 24 to 85mm zoom; 14mm with built-in wide flash adapter Film Speed Range in TTL auto flash mode : ISO 25 to 1,000 Recycling Time : Approx. 3.5 sec. with AA Alkaline manganese batteries, 4 sec. with AA lithium batteries Number of Flashes : Approx. 200 (Alkaline) 400 (Lithium) Power Requirements : Four AA-size batteries Dimensions : Approx. 68.0 x 123.5 x 90mm (2.7 x 4.8 x 3.5 in.) Weight (without batteries) : Approx. 10.6 oz. Other Features : Modeling flash, LCD panel illumination, Color filter set Supplied Accessories (may differ by country or area) : Speedlight Stand AS-19, Soft Case SS-600 Compatible Memory Module