Sdive T1 is a palm-sized dive light with a mechanically rotary switch. The rotary switch offers high reliability underwater. Using the USA CREE XM-L2(U4) LED, its max output can reach 1000 lumens. Powered by one 18650 battery, its max runtime can reach 3 hours. Featuring * Cree XM-L2(U4) LED, max 1000 lumens output * Uses 1*18650/2*CR123A/2*16340 battery * Mechanically head rotary switch offers high reliability underwater * Water pressure resistant construction ,depth rated to 150 meters * Reverse polarity protection, to protect from improper battery installation * Over-discharge protection function * Aircraft-grade high strength aluminum material * The latest diamond grade hard-anodized seawater-corrosion-resistance finish * Alloy aluminum reflector with professional optical analysis