Steripen's Freedom Water Purifier gives you the freedom to drink water anywhere you go! Perfect for outdoor, business and adventure travel. It's SteriPEN's smallest, lightest and first rechargeable UV water purifier. Eco friendly, the SteriPEN Freedom's integrated battery recharges via a micro USB B port recharge via computer, AC outlet or compatible solar charger. It provides 8000 0.5L 16 oz. water treatments. In 48 seconds, the germicidal UV light destroys over 99.9% of bacteria, viruses and protozoa such as Giardia and cryptosporidium. One liter volumes may be disinfected by treating twice. SteriPEN Freedom is highly portable 74g 2.6 oz and easy to use. Using instant on technology with LED indicators, follow 3 easy steps: 1 Remove the lamp cover, 2 Immerse the quartz encased UV lamp , 3 Stir autotimed for 48 seconds. The green indicator light lets you know when it's safe to drink the water. It also serves as a UV flashlight and USB cable. AC adapter and neoprene case included. Usage: Up to 40 treatmentscharge Treatment: .5L 16 oz. in 48 seconds, one liter volumes may be disenfected by treating twice Battery and UV lamp life: 8,000 16 oz. 0.5 L treatments Size: 5.1x 1.4x 0.8 Weight: 2.6 oz.