Four Channel BroadcasterThis device allows for communication between track director, remote controllers, in car flagging units, and LED signboards More channels allows for higher information loads (more cars, more signboards, data, etc.) Device should ideally be mounted at a high, open location with straight line visibility to track and other broadcaster(s) Can be mounted with Flagtronics Aluminum Extendable Pole that extends 20 ft. Can be paired with Recharging Solar Panel