Colour:RedMaterial:ABS5 LED lightsBattery:AAA X 2(Included)Luminums flux:50-100LMFour ModesStrong/Dim/Slow flashing/Circulated flashingWaterproofSize:52mm X 81mm X 41mmSuitable for the tube which has a diameter between 23MM-32MMAccessoriesOne Rear lightOne HolderTwo Gasket