Specification:

Lamp Type: 1 Watt Luxeon LED
Light Output: 25-30 lumens

Battery type:
GT-287A: 1pc 3.0V CR123A lithium battery
GT-287B: 2pcs 3.0V CR123A lithium battery
GT-287C: 2pcs 1.5V AA battery

Dimensions:
GT-287A: 8.6 * 2.6cm,
GT-287B: 12 * 2.6cm,
GT-287C: 15 * 2.6cm,

Weight w/Batteries:
GT-287A : 180g,
GT-287B: 210g,
GT-287C: 230g,

Burn Time:
GT-287A: 3 hours,
GT-287B: 6 hours,
GT-287C: 3.5 hours

Focus Type: Spot
On/Off: Tailcap Switch(momentary)
Material: Aluminum