- Uses 1 * 21700 Li-ion battery<br /> - 6° beam angle<br /> - Mechanical head rotary switch offers high-reliability underwater <br /> - Intelligent Over-Heat protection<br /> - Water pressure resistant construction, depth rated to 150 meters<br /> - Reverse polarity protection, to protect from improper battery installation<br /> - Over-discharge protection function<br /> - Constructed from high-strength A6061-T6 aluminum <br /> - Mil-Spec Type III hard anodized finish for durability and corrosion resistance<br /> - Two sides coated toughened glass with high water pressure resistance under deep water<br />">