Sense of vibration and Photosensitive: LED flashes when the wheels are moving on at night, and turn off when the wheels stop. (LED flashes only at night) Color of lamp tube: blue,green,red,yellow for your option. LED light: rainbow or just one color (blue, red, green, ect.) No button designing for fully waterproof Energy saving design, flashing when your bike moves and off when your bike stops Decorative light for motorcycle and bike High Quality, super bright, durable and long lifespan, high Impact ,water and RUST Resistant This warning light is very easy to use, just plug it on the valve of tire/wheel of your bikes/ motorcycles or even cars Increases the visibility of nighttime and bad weather to enhance safely This Flash Valve Sealing Cap is the best product to pop up your awesome vehicle at the night. 2pcs into blister card(2pcs/Pair) 50pair into small box 500pair/carton MEAS:42.5X33.5X50.5CM Weight:20kg/21kg.