Nitecore EC11 900 Lumens Brightest Mini Cree XM-L2 U2 LED Flashlight with 1X Nitecore Rechargeable LMR 18350 Battery High efficiency constant current circuit enables maximum runtime of up to 20 hours Waterproof in accordance with IPX-8 ( 2 meters submersible) Impact resistant to 1.5 meters Secondary red LED provides constant /flashing illumination Dual switch design ensures ease of use