Pull-to-turn locking rotary knob prevents accidental mode changes; Push-button switch enables/disables selected lighting source starting at low intensity and progressing to the brightest intensity in 4 steps; Double-click of button initiates high intensity strobe of selected light source; Cord attachment holes provided in battery compartment cover capable of supporting 25 lbs of load; Tethered battery compartment cap facilitates battery replacement in the dark without losing cap; Powered by two (2) AA alkaline batteries (included); also accepts two (2) AA lithium batteries; High impact super-tough nylon case offers exceptional durability and weather resistance; All openings are O-ring sealed; Unbreakable polycarbonate lens with scratch-resistant coating; Gasket sealed; IPX7 waterproof to 1m for 30 minutes; Clam Pack