insight WL1-AA spec:
Peak Output: 150+ Lumens
Run Time: Up to 90 minutes with Lithium batteries
Waterproof: Rated to 1 meter for 5 minutes
Interface: Quick Release Rail-Grabber™
Weight: 3.4 oz. (WL1-000-A1) 3.5 oz. (WL1-000-A2) 2.9 oz. (WL1-000-A3) 3.0 oz. (WL1-000-A4) Lithium Battery
Power: 3V from Two (2) EnergizerR Lithium AA Batteries (fully compatible with Alkaline AA)
Warranty: Limited Lifetime Warranty