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