The Sidewinder Compact II accepts multiple power sources: one CR123A lithium battery, one AA lithium battery or one AA alkaline battery to provide ultimate flexibility in the field.The same great features as the original Sidewinder Compact: lightweight, multi-directional and multi-functional. The difference? It accepts a variety of different battery types to ensure you always have a power source wherever and whenever duty calls.- Uses one 3V CR123A lithium battery (included). Also accepts 1 AA lithium battery or 1 AA alkaline battery- Four individual light sources:- C4 LED, white, impervious to shock with 50,000Hr lifetime- 5mm Blue LED, 470 nm peak wavelength, impervious to shock with 100,000Hr lifetime- 5mm IR LED, 880 nm peak wavelength, impervious to shock with 100,000Hr lifetime- 5mm Red LED, 630 nm peak wavelength, impervious to shock with 100,000Hr lifetime- Sidewinder Compact II Light Output and Battery Run Time- Pull-to-turn rotary selector knob prevents accidental mode changes and allows selection of LED color- Rubber dome actuator and 4 position pull-to-turn locking rotary selector knob with IR LED tactile indicator provides easy operation even when wearing heavy gloves- Powers on at low output and progresses to high intensity in four discrete steps- IR Safe mode prevents accidental activation and battery depletion while in IR mode- Double-click push button to initiate strobe (all LED colors have a strobe function)- 185 tilting body. Rotates 360 on helmet mount- Durable clip attaches to helmet, headstrap or MOLLE vest.- Cord attachment hole provided in clip capable of supporting 25lbs of load- 3 meter impact resistance tested- IPX7/waterproof to 1 meter for 30 minutes. O-Ring and gasket sealed openings. Meets MIL-STD-810F, Method 512.4