The SteriPEN Ultra Portable UV Water Purifier is the device that smiles back! SteriPen Ultra is the most advanced UV water purifier in the world. Simply power on and choose the amount of water your are treating (0.5 or 1 L), place the lamp in the water and stir until you see the smiley face indicating the water is ready. Rechargeable for up to 8,000 liters, Ultra will deliver around 50 liters of UV purification before needing to power up. Redesigned firmware and interface deliver the fastest, most seamless user experience ever!