Under 4" long and weighing just 2.5 ounces, the LEDLENSER ML4 Rechargeable Lantern delivers surprisingly bright light for its size—a maximum of 300 lumens, as powerful as many full-sized lanterns and flashlights. It comes with a carabiner clip so you can hang it just about anywhere, and recharging is as easy as snapping on the magnetic charging cable. Power is supplied by a 14500 li-ion battery, but if that's unavailable, you can use an AA alkaline cell instead. The lantern is set up for three brightness levels, two levels of red light to preserve night-acclimated vision, and a blink mode. Power and setting are controlled by a single top-mounted switch, which also serves as a handy battery power indicator. It's built for the outdoors with an IP66 water-resistance rating, and it bears fluorescent elements to make it easier to find in the dark.