Set up : simply screw on your tire valve stem
Can be applied in auto car as well as bicycle.
Will be off when the vehicle stops, on when it runs, and flash when you're driving at night.
Light Sensor, only light up in dark environment and while wheels are spinning
Easy to install, twist off your original valve cap, and replace with our valve cap LED light
Battery required : 3*AG10(included)
This Hot Wheels can be installed in cars, motorcycles , electric cars , and mountain biking .