Topeak iglow bottle cagethe iglowcage will turn your night ride into a wild adventure ingenious integration of a super bright rgb led into the water bottle cage gives you multiple choices of colour to illuminate the clear bottle for 360 degree visibility features material injected high impact resistant plastic lamp 1 super bright rgb led 5 colours purple blue green yellow white compatibility mtx trunkbagsmtx rear baskets battery cr2032 x 2 included burn time approx max 50h