They have to be in water to work. The engine will only start when the water is detected which protect the engine and prolong its life.
UDI RC Boat Electric High Speed Remote Control Racing Boat for Adult Kids 2.4GHz
9IMOD RC Boat HJ812 High Speed Racing Boat 25KM/H 2.4G Remote Control Speedboat
WLtoys RC Boat Electric High Speed 2.4GHz Remote Control Racing Boat Adult Kids
Wave Master RC Boat BLUE High Speed 17 MPH 2.4GHz Wireless Remote
Wave Master RC Boat Red High Speed 17 MPH 2.4GHz Wireless Remote
