OLIGHT i3E EOS Waterproof & Durable Mini Flashlight Key Light Color: Black This mini light is 60.5mm * 14mm in size, about the size of a man's little finger. It uses a single AAA battery and is easy to use in single mode, turning on when the head is tightened and off when loosened. Equipped with a Philips LUXEON TX LED and PMMA TIR, it can output a maximum of 90 lumens. The maximum beam distance is 44 meters. Furthermore, it has a 1.5-meter drop resistance and IPX8 waterproof rating, so its performance is not affected even if temporarily submerged in water.