Virtually indestructible, high-performance LED is regulated to maximize output and runtime Proprietary faceted reflector creates broad, flawless MaxVision Beam™ that matches your field of vision—and allows for better situational awareness Head switch—simply twist counterclockwise repeatedly to activate and set output level or turn off Powered by an included rechargeable AAA NiMH battery (charger sold separately); can also be powered by a readily available AAA alkaline battery and a AAA lithium battery Included stainless steel split ring on tailcap easily and securely attaches to keys