This is the Saltdogg 3011864 Gritter Controller suitable for use with the TGS02, TGS03 & TGS07 tailgate salt spreaders.
It is powered directly from the vehicle electrics and needs to be connected directly to the vehicle's battery, as the ampage draw is too high for it to be plugged into an accessory socket.12 volt.
It has power On/Off Switch.
A separate button to activate the vibrate motor.
Variable Dial Switch whcih controls the Spinner/Auger Speed, for accurate salt and grit application.
Blast Button, this puts the spinner and auger to maximum for a short period if there is an area which needs an extra blast of grit or slt.