Flash Coverage: Covers 35mm lens. With Wide Adaptor, covers 28mm lens.
Size: 72 (W) x 58 (D) x 107 (H)mm. (2-13/16" x 2-5/16" x 4-3/16").
Weight: 310g (10-15/16 ozs.) including batteries.

Speedlite 166A

Guide Number: 20 (ASA100, m) or 33 (ASA 25, ft)
Recycling Time: 0.5-7 sec. with alkaline batteries and 0.5-5 sec. with Ni-Cd batteries.
Number of Flashes: 250-2500 times with alkaline batteries and 80-830 times with Ni-Cd batteries.
Flash Duration: 1/1000-1/50000 sec
Auto Apertures: f/2.8, f/5.6 at ASA 100.
Auto Coupling Range: 0.5 -7 m (1.6-22 ft.) at ASA 100
Flash Coverage: Covers 35mm lens.