The Photon Micro-Light II LED keychain flashlight is an incredibly bright and ruggedly tough miniature portable light. It has a dual function on/off switch plus a momentary squeeze button. About the same size and weight of an US quarter, this light can be easily attached to your keychain and taken anywhere. Its solid construction is designed for a lifetime of trouble-free use, and the long-lasting, replaceable lithium battery is always ready even at subzero temperatures. The Photon Micro-Light II's super-bright LED generates a powerful beam visible over a mile away, and is able to illuminate any path. The versatility, superior engineering, and durability have made the brightest-for-its-size Photon Micro-Light a highly demanded accessory for personal safety, police forces, NASA shuttle crews, and Secret Service personnel. Green: The green light is nearly as bright as the blue, turquoise, and white lights while offering a slightly longer battery life. Because the green LED bulb tends to be a bit more efficient than the other colors, it can run for up to 20 hours with one set of batteries. 525 nm