The I5T EOS is a sleek and elegant flashlight with a rear switch and only runs on a regular AA battery. The lamp is equipped with an excellent LED in combination with a TIR lens that provides a soft, even light beam. The lamp provides up to 300 lumens of light up to 60 meters. Comes with 1x AA Alkaline battery and also works on 1 x 1.5V AA NiMH batteries. Note: i5T does NOT work on Lithium batteries. Light modes: 150 minutes burn time at 300-30 * lumens - 60 meter range 20 hours burn time at 15 lumens - 12 meter range Choice of constant or momentary on. depending on battery power, the lamp will burn in the 300 lumen mode for as long as possible. if the retaining capacity is too low, the lamp will burn at the 30 lumen setting.