The NITECORE SRT9 is the most powerful flashlight in the SRT series yet! This super bright 2150 lumen max output flashlight also offers red, green, blue and UV secondary LEDs for a versatile flashlight you can use day in and out. Featuring NITECOREs patented SmartRing technology and a high power CREE XHP50 LED, the SRT9 can be adjusted infinitely from 0.1 lumens to 2150 lumens via a selector ring located near the bezel. Color outputs and special modes are also quickly accessible this way too. Meanwhile, a tactical tail cap switch controls on/off functionality. Constructed from durable aerograde aluminum, the SRT9 has a diecast unibody which improves heat dissipation and overall performance. This flashlight runs on 2x 18650 batteries or 4x CR123A batteries for up to 250 hours on the lowest output. Whether youre using the white output for primary illumination or the color LEDs for hunting, inspecting, tracking and vision preservation, the SRT9 is the high performance flashlight youll love.