SteriPEN Traveler Mini Opti Portable UV Water Purifier - Silver/Black Product Details The Traveler mini with its sleek compact design is the smallest lightest and easiest to pack SteriPEN for travel. Weighing just 103 grams/3.6 oz. the Traveler mini fits neatly into your checked luggage carry-on or briefcase. It might be smaller but you still get all the speed power and effectiveness of larger SteriPENs. The Traveler mini purifies a half-liter of water in 48 seconds, just like the bigger models - but all in a smaller lighter device. The Traveler mini uses 2 CR123 disposable batteries (not included). As a reminder, battery quality varies greatly by brand. We recommend using only well-known brand name Lithium batteries. Alkaline batteries of any kind are not recommended. Specifications Weight (grams) 105 Dimensions 6.1in. x 1.5in. x 1.0in. Battery Type CR123 or RCR123 Batteries Included In Purchase No Battery Life Disposable-100 treatments (16oz./0.5L) Rechargeable-40-50 treatments (16oz./0.5L) UV Lamp Life 3000 Treatments Minimum Bottle Diameter 35mm (1.4 inches) Filter Compatibility Non-Tapered End (FitsAll Only)