Carrier handheld navigator. Brand new with carrying case and operating instructions. Used to acess control system on Carrier chillers, rooftop units, and control system components. With this tool systems can be confiqured,setpoints adjusted, alarms monitored/reset and viewing of system operating temperatures,pressures,etc.Retails for 1900.00 from Carrier. Selling for 700.00. If you have any questions please feel free to ask.