rainbow flash led 1.suitable for cars,motocycles, bicycles 2.using a long time, with light-sensitive resistors 3.waterproof. rainbow flash led1.suitable for cars,motocycles, bicycles2.using a long time, with light-sensitive resistors,and its is bright only in darkness.3.waterproof. 4.rainbow effect,other products at most three kinds of light.5.The battery is good, durable, easy battery change. ...