https://www.dealextreme.com/details.dx/sku.3607 - $11.30 Cree diode, 1xAA, battery life is probably going to suck, but it's not really a hassle to toss an extra battery in your car for when you need it. Aircraft type "Maglite" aluminum chassis and good solid rubber O-rings on both ends. I wouldn't trust the seals underwater for very long, but I'm sure it's watertight enough to use it in the rain without worry. The light is quite bright and would be more likely used as a defensive tool - If someone is threatening me I can use the light to blind them/take their attention off my other hand which will be going for my gun Oh, and it's quite small also, easily small enough to leave in a coat pocket and forget about it. It's about 5" long.