LED arrow board consists of aluminum plate and LED accessories.It is waterproof and fog-proof.When the weather is terrible like haze,rain,or snow,it can be helpful for the drivers to keep the stopping sight distance,besides there is a dynamical LED accessories,that can give a good warning.It is 6V direct current through dry cell,solar energy or connection with other power.Its weight is low,and it's convenient for carring and storage.