The Electric/Hydraulic Spreader Control from Buyers Products gives you industry leading value and performance in proportional spreader operation. Electric control systems eliminate the need for bulky hydraulic controls in your cab. Two systems are available, both featuring proportional valves housed in a weather-protective enclosure and a weatherproof, corrosion-free wiring harness. HV715EPG/HV1030EPG The 3 Function Controller with LED Display has spinner, auger-conveyor and electric pre-wet controls. It's available in two models for higher or lower GPM needs. These models have a "G" in their model number to signify that you can add a Garmin GPS receiver as an option. With the Garmin GPS unit, you gain more precise and cost-saving performance. The GPS feature plugs in easily on any truck. Set for current conditions, it continuously calculates your vehicle speed and adjusts spreading accordingly to reduce waste and cost. HV715EP/HV1030EP The 12V Programmable Controller with LED Display has auger-conveyor/spinner controls. It's available in two models for higher or lower GPM needs. The GPS option is not available for these models.