Steripen Classic 3 UV Water Purifier

Features
Ergonomic design with a new easy-to-remove twist-off cap.
The first SteriPEN to work effectively with alkaline batteries. Can be powered by alkaline, lithium, or NiMH batteries.
Enhanced LEDs indicate treatment size and status of batteries and lamp.
Watertight. No more worries about dropping your Classic 3 in a bottle or stream.
So easy … just activate, place in water, and stir. LED indicators flash to let you know when water is safe to drink.
Specs
Weight: 2.9 oz (82 g)
Dimensions: 7.3 x 1.7 x 1.7 in (186 x 43 x 43mm)
Lamp Life: 8,000 activations
Battery: 4 AA batteries – Alkaline, Lithium or Rechargeable NiMH (Not included with purchase)
Battery Life: Alkaline: 100 treatments (16oz./0.5L) or 50 treatments (32oz./1L), Lithium Disposable: 300 treatments (16oz./0.5L) or 150 treatments (32oz./1L), NiMH: 200 treatments (16oz./0.5L) or 100 treatments (32oz./1L).
Minimium Bottle Diameter: 22mm (0.8 inches)
Filter Compatability: SteriPEN Pre-Filter Included