Line:Independent circuit design, consisting of dynamic sensing circuit and lighting circuit Package Includes:4pcs Bicycle Valve Lights Material:semi-aluminum,semi-plastic Power:3 sections AG10 button battery (without included) Color:red, yellow, green, blue Color: pink Size: 60*8mm Included: 4* valve light Steps: 1.This type of is a single induction vibration type, that is, the wheels turn up and turn bright, and they turn very beautiful. 2.Fine craftsmanship 3.Screw it onto the valve of the wheel. Note: 2. In the first link, pay attention to the battery anyway, don't pretend it 3. This lamp has a condition that is inductive and vibrating, and it will flash when there is vibration. In the case of relatively static, the lamp is also not bright.