Regulated power supply can maintain constant output.Over-heat protection, preventing the high temperature from influencing the normal use.Low voltage warning function to remind the user to change the batteries.Reverse polarity protection to protect from wrong battery installation. Side magnetic switch, three output modes, very easy to operate. Three O rings design to underwater 200 meters. Premium type III hard - anodized for abrasion and corrosion resistance. 5mm toughened glass can stand higher water pressure resistance. Name: Switch Mode: High/Middle/Low Function: Hard Light Length: Non-adjustable Lumen: 1000 Zoom: No Lighting Distance: 200-500 m Wattage: 10W Charger: Rechargeable Battery Type: 18650 Item Type: Flashlights Flashlight Type: diving,underwater work,Tecchnical and deep diving : LED Bulbs Waterproof: Yes Illumination Distance: 150m Intensity: 6000cd Beam angle: 9 degree beam angle Max runtime: 15h Waterproof Grade: IPX-8 underwater 150m Lifespan: over 50,000 hours Charging time: 2-3hours Application: Tecchnical and deep diving Switch Mode: High: 1000 lumens / 2h Medium: 500 lumens / 4h Low: 150 lumens / 15h Quantity: 1 LED Type: XM-L2 (U4) Lifespan: over 50,000 hours Battery: 1 x 18650 rechargeable lithium battery (Not include) colour:black Material:Aluminum alloy size:Head diameter: 51.5mm Tail diameter: 44mm Length: 150mm Height: 135mm Package Contents: 1 * diving flashlight 1 * waterproof ring 1 * hand strap 1 * lubricant Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.