Flash Exposure Control: Slow-sync, red-eye reduction, red-eye reduction in slow sync, rear-curtain sync flash, FV lock flash, manual flash (with Nikon Creative Lighting System digital and 35mm SLR cameras).
*i-TTL, M (manual with the D40 only)

Guide No. : 30m/98.4ft. (ISO 200, m/ft at 18mm zoom-head position, 20 degrees C/68 degrees F)
Angle of Coverage : 56o (digital SLR format)
Vari-Power : no
TTL Dedication : i-TTL
Bounce Head : yes
Swivel Head : no
Zoom Head : no
Off Camera Terminal : no
Recycle Time : 2.5 Seconds with fresh alkaline batteries & full power
Minimum Number of Flashes: Approx. 140
Power Source : 2x1.5-Volt "AA" batteries
Dimensions (WxHxD) : 66 x 56 x 79mm
Weight : 127 g (w/o batteries)