This is the OTS Rail System w/ Light & Motion SOLA 800 Light Features: SOLA 800: We asked divers what they wanted in a dive light. They told us: spot & flood beams, small, lightweight, easy to use, easy to recharge. Introducing the Sola 800; its the lightest, brightest and smallest dive light you have ever seen. Lumens (Flood/Spot): High- 800/500 Med- 400/250 Low- 200/125 Run Time (Flood/Spot): High- 60/70 Min Med- 120/140 Low- 240/280 Charge Time: 150 Minutes Size & Weight: 57mm x 101mm & 305 gr. w/ Wrist Strap Ready To Go Sola dive lights have a factory sealed body so you never need to worry about flooding. Control is accomplished through a magnetic coupled slider on the top of the body. Slide forward or back to turn on. Hold forward or back to turn off. Three indicator lights behind the bezel report the power (high=3 lights, medium=2 lights, low = 1 light). Indexing back changes mode between spot and flood. Indexing forward increments the power levels.