Now powered by alkaline, lithium, or NiMH rechargeable batteries Enhanced LEDs indicate treatment size and status of batteries and lamp More ergonomic with an easy-to-remove twist off lamp cover Watertight! No more worries about dropping your Classic 3 in a bottle or stream So easy.....just activate, place in water and stir. LED indicators flash to let you know when the water is safe to drink. Treatment Time: 48 seconds (1/2 litre) 90 seconds (1 litre) Usage: Up to 150 litres per charge (lithium disposable batteries) UV Lamp Life: 8,000 treatments Dimensions: 18.5cm x 4.3cm x 4.3cm Weight: 178g (including batteries)