This latest version of the RD80 has 1500 lumens – extra bright and more buring time. The RD80v2 has been tested to 100m and this great light uses 21700 Li-Ion battery (included), Burning time is up to 3.5hours. One time charging, one day diving. Charged by Type C cable, micro USB straight into the battery, easy and environmental friendly travel. Specifications Mode: ON->High(1500lumens at 3.5hours)->Low(750lumens at 7hours)->SOS->OFF. Battery: 1 x Li-Ion 21700 battery, Type C USB straight into the battery. Working voltage at 2.7-4.5v. Depth Rating at 100M Lens: 4mm toughened ultra-clear glass with diamond coating Beam Angle: 15° Patented side switch for non-visual, one-handed torch operation. Power indicator at button switch:Green(power>70%)-> yellow (>30%)->Red (<30%) High grade Aviation Aluminium Alloy with Military Oxidation III grade casing for hardiness and anti corrosive in Sea water Internal circulation conduction to reduce corrosion of the body. Dimensions: 150mm (Length) x 26mm (Body) x 36mm (Head) Net weight: 200 User Manual: NA-EM10IV Manual Download PDF