This simple switch will easily fit onto the end of your AA Maglite to give you five new functions. 5 light modes: 100%, 50%, 25% power, slow, fast strobe 3 power levels - extends battery life - Lasts four times longer! Auto-off (14.5 minutes) in the first 3 modes prevents accidental drainage At 13 minutes the light will flash to signal that it is close to shutting off and prompt you to hit the button to re-activate for another 14.5 minutes. Find-in-the-dark flashing LED Easy to install