RC-2M2 Two Motion Two Speed for Monorail Application Key On/Off, E-Stop, 2 Transmitters and 1 Receiver. This Series of Radio Controls are ideal for smaller, simpler operations such as light-duty cranes and monorails. The RC-2M2 Series Radio Control offers the user 2-step pushbuttons, while the RC-3M1 Series Radio Control has 1-step pushbuttons. Both wireless control systems operate on exceptionally low power consumption (up to three months on two AA batteries) and feature a user-friendly design. Operating range for the remote system is 300+ feet.