... *Finish: HA Type III *Waterproof: IPX8 (Underwater 100 meters) *Switch: Head Twisty Switch (Magnet control Switch) *Modes: Max-Mid-Min-Strobe ... correctly inserted, screw the tail cap onto the body fully. Rotary Head Twisty Switch to change modes between Max,Mid,Min,Strobe ... cap, insert the batteries with the positive ends toward the head of the light, replace the tail cap. Output & Runtime:*Max ...