From the manufacturer

The Steripen Classic™ 3 is the latest, most versatile model in our award winning Classic line. Winner of Time Magazine’s Best Invention of 2001, it offers enhanced ergonomics and battery life as well as improved water resistance. An 8,000 treatment lamp delivers a lifetime of purification.

Features

• Treatment size: 1/2 or 1 liter
• Treatment time: 48 or 90 seconds
• Lamp life: 8000 activations
• Battery: 4x AA Batteries, Lithium or rechargeable NiMH

Specifications

• Water Source: tap water, clear water
• Group size: 1, 2-5
• Usage: Often
• Product type: UV pen
• Effective against: Bacteria, protozoa, cysts, virus
• Treatment type: Purification
• Output: 0.5 liter (48 sec), 1 liter (90 sec)
• Weight: 178g
• Dimensions: 7.3 x 1.7 x 1.7
• Batteries required: Yes (not included)
• Battery type: 4x AA
• Product life: 8000 activations