ThruNite TN15 --- Big Brother of TN12: High Lumen, Farther Throw, Heat Dissipation Mechanism, Remote Pressure Switch, Extension Tube, One-inch Body, Waterproof, Strobe, Your Best Choice for Hunting and Searching! (TN15NW+remote switch) 1.The ThruNite TN15 features six output modes with each setting designed to be ideal in its own way. 2.The compact design of TN15 fits comfortably in your pocket, backpack, or anywhere else you keep . 3.ThruNite has specially designed a remote pressure switch for the TN15 for use in hunting. 4.Equipped with the advanced CREE LED XM-L LED, the TN15 achieves what was thought to be impossible 5.Running on just one 18650, two CR123, two 18650 or four CR123 with the extension tube.