Sdive E2 is an 1800 lumens primary dive light powered by the latest 21700 batteries. The side switch offers 3 brightness level which allows for easy operation underwater. The LED indicator light located on the switch button also lets you know the battery’s remaining charge. Featuring * Uses CREE LED, max 1800 lumens * Uses 1*21700 Li-ion rechargeable battery * 10° focus beam angle * Easy operation with the side switch * Battery indicator * Intelligent Over-Heat protection * Water pressure resistant construction ,depth rated to 100 meters * Reverse polarity protection, to protect from improper battery installation * Over-discharge protection function * Aircraft-grade high strength aluminum material * Alloy aluminum reflector with professional optical analysis, etc.