FETESNICE MTB Road Bike Bicycle Headset Stem Watch,Cycling Head Parts Bike Headset Top Cap Stem Cover (Black and red)
Specification: Material: High Quality Aluminium Alloy 100% Waterproof, Shock resistant, Grow in dark Battery came installed How to install: 1. Remove bike headset,put the base of the bike watch into the device. 2. Tighten the base of the Bicycle watch with a hex wrench . 3. Put the watch on the base,Lock the upper cover.