The IllumiLast technology on a Coleman ILX500 Led Flashlight stops battery drain, so you'll have Power When You Need It. On a normal flashlight, there is typically some residual drain as long as the battery is connected in the circuit, even when the light is off. But when you turn off the switch on this flashlight, you can completely disengage your batteries, so it retains it's brightness twice as long and the batteries last 25% longer. You'll also reduce damaging corrosion, so the batteries can be stored in your flashlight for years (up to their inherent shelf life). The comfort-grip design helps minimize the chances of dropping your light, and if you do, the strong, lightweight aluminum construction and a rubber-edged bezel protect against impacts from falls of up to two meters. That's twice the impact resistance of most other lights. No matter the situation, from power outages to roadside emergencies, a flashlight with IllumiLast technology is ready, even when you aren't.