CatEye: The HL-EL160 with a waterproof construction is a great companion for your commute or leisure ride.Long runtime3x brighter than EL135OptiCube™ lens technologyWaterproof IPX7: Operates even after 30 minutes of submersion in a depth of 1 meterLow battery indicatorAA alkaline battery x 22 light modesMode memory functionFlexTight™ H-34N bracket Tech SpecsDimension: 89 x 38 x 32mmWeight: 83 grams (light unit and battery)Light source: White LED X1Runtime: Constant mode 50 lumens:30hrsFlashing mode 50 lumens:250hrsBattery: AA alkaline battery X2Water resistant: IPX7