Compact and long lasting, the 9-LED light is 1-1/8" in diameter and 4" long.
The 21-LED light, 2-1/3 times as bright with a heavier body construction, is more like a small spotlight than a flashlight. The distance it can span is impressive. It is 1-3/8" in diameter and 3-1/2" long.
Each light comes with three AAA alkaline batteries installed, enough to power the 9-LED version for 20 to 30 hours, or the 21-LED light for 16 to 20 hours in continuous use.