The new Sunpak RD2000 flash is a lightweight, compact and full featured digital SLR flash for digital and film cameras. Compatible with the latest Nikon i-TTL Digital SLR cameras and has many advanced features. Such as easy to use controls, articulated hot shoe, wide-angle panel and EV adjustments. With a high guide number of 65 (ISO 100/feet), the RD2000 can provide superior illumination in any situation. With seamless integration with the latest offerings DSLR cameras, there is no reason to look any further for a flash that is more capable. Auto power off feature to keep batteries from going dead Recycle time for full output - Alkaline approx. 5 seconds, Ni-MH approx. 4 seconds EV settings - Five settings in one half stops (-1, -0.5, 0, +0.5, +1.0) Flash duration - Approx. ,000 - 1/30,000 second Runs on 2 AA Alkaline or Ni-MH batteries which keep it small and compact Up to 200 flashes at full power with alkaline batteries Up to 280 flashes at full power with nickel metal hydride batteries Display - LED Dimensions - 1.7 high x 2.36 wide x 3.46 deep Weight - Approx. 7 ounces (without batteries) Compatibility - Nikon i-TTL - D40, D40x, D50, D60, D70, D70s, D80, D200