Dear，Pls leave a massage to tell us what design (Color) do you want.thank you.

Size： 31 mm x 16 mm (without locking screw) x 30 mmWeight: 5.5 g Approx.Lamp: Red LEDFunction:waterproofUse an adjustable stainless steel leaf spring switchMay be secured to sidepull Caliper brakesUse CR1025 battery(battery is not inclueded)50 hours continuously