Nitecore TM26 Battery Type: 4x186508xCR123 Maximum output: 4000 lumens Flashlights World's smallest 3500 lumen LED flashlight 4 x CREE XM-L LEDs Multi-function OLED display Compatible with both 18650 Li-ion and CR123 batteries Waterproof in accordance with IPX-8 (submersible to two meters)