ProMaster 2500EDF Nikon Electronic Flash for Nikon Specifications: Guide Number: 66 (ISO 100)TTL Auto Range: 4.9 ? 33?Power Source: 2 AA alkaline or PROMASTER rechargeable NiMH batteriesRecycling Time: 0.3-10 secondsAngle of Coverage: 60? H 45? V Covers 35mm lens on 35mm camera or 21mm lens on digital format SLRBounce Angle: 0? to 90?AF illuminator for autofocusFull digital auto TTL dedicationFlash upgradeable by your PROMASTER dealer Weight: 2