Small correction for those who really do not have the right tools at their litters: the lamps light with better battery (or batteries) 3.7V. Normal 1.5V walk but the brightness is much less than 3.7V. Otherwise I put 4 * because I ordered a 400 Lumens and this one of 600Lumens, and both are kif kif lighting. There is nothing to differentiate them. Both physically (same package, same visual appearance, no special logo on the metal body or other) for lighting. But this is a great product. Especially for the price. Small, easy to use, convenient, very bright.