motion activated vaive stem lights. increases nighttime visibility for safety. screws onto your tire valve stem. bring more color to your cars. "flash color" is a new dynamic glittery decoration for cars. It consists of light control circuit, induced circuit,luminescence circuit. Independent circuit design, no need to change or connect with the circuit of a car, directly install it to the tyre valve. It provides the flash light which doesnt flash in the daytime and at night it flashes when the car starts and it will become a complete bright aura in responde to the turning wheel, which can show your safety and add joy to your life. It is very popular among car decoration firms.