The Fenix TK60 is a high-intensity and extremely long runtime flashlight powered by D batteries. Using the latest Cree XM-L LED, it has a max 800-lumen output which is comparable to an HID light. With the extension tube, the output can maximize up to 800 lumens in the turbo mode and the max runtime can reach 15 days. The design of 2 modes and 6 brightness levels can satisfy the need for high intensity when searching as well as the requirements in various conditions. Therefore, the TK60 is the best choice for exploring, searching, law enforcement, hunting or using as a spare light for automobiles, etc.