ELMCL21L: The Energizer Water-proof Lithium LED Flash light is made from aluminum alloy so it's extremely lightweight and durable. The Lithium power of this flash light increases runtime, even in extreme temperatures. In addition, the LED bulb inside the Aluminum Alloy Water proof Lithium Flashlight by Energizer is brighter than the conventional light bulbs. This Energizer LED Lithium Flash light is a good choice for adventure seekers and outdoorsmen looking for a durable flashlight. Available Energizer Lithium LED Aluminum Waterproof Flash lights: Model ELMCL11L: Body Type: Aluminum Size: 1AA Lumens: 65 Bulb Type: LED Model ELMCL21L: Body Type: Aluminum Size: 2AA Lumens: 110 Bulb Type: LED