SteriPen Solar Charging Case Portable Easy to carry, light weight accessory for the SteriPEN Adventurer or traveler handheld water purifiers. Only 7 oz. with batteries Convenient Charges wherever the sun shines Versatile Also charges by plugging in with the included power adapter Durable Protects your SteriPEN Traveler or Adventurer while traveling with the case's storage compartment of molded soft foam. Effective Powers up two CR 123 batteries with solar power in 2-5 days and wall power in 4-6 hours