From the manufacturer

The smallest and lightest model of the Steripen series is the UltraLight, which can be used to treat 1L per application. Due to its small pack size and weight of only 76.5 grams this small UV purifier is predestined for minimal baggage. The lifespan of this new water purifier is 8'000 uses and its permanently installed battery can be charged using a USB cable.

Features

• Treatment size: 1 liter in 90 seconds
• Dimensions: 13 x 3.5 x 2.2 cm

Specifications

• Water Source: tap water, clear water
• Group size: 1, 2-5
• Usage: Often
• Product type: UV pen
• Effective against: Bacteria, protozoa, cysts, virus
• Output: 1 liter (90 sec)
• Weight: 76g
• Batteries required: Yes (included)
• Battery type: Internal USB rechargeable lithium-ion
• Product life: 8000 activations