This is a Maglite Solitaire LED keychain light.

Specifications and Features
Battery Life: 1hour, 45 minutes
Brightness: 35 Lumens
Weather Resistant
Length: 3-3/16"
Barrel Diameter: 1/2"
Head Diameter: 1/2"
Weight with batteries: 0.8 oz.
Batteries Required: (1) AAA size alkaline (included)