Lodar Locator 2-4 Function Remote Control Transmitter Holder With Micro Switch, A rigid holder to be fitted in the cab of the vehicle for 2-4 function Lodar handsets. The benefits of having a micro-switch are obvious, unless the transmitter handset is returned to it's holder (depressing the micro-switch) a light or buzzer device (not supplied) will continue to remind you the handset has not been returned to it's correct place.