This Sunvic SunPro 2000 2 channel programmer is a reliable and efficient device for controlling your heating and cooling systems. With a 3-wire configuration and line voltage of 24V, it is compatible with heat pumps, ductless mini-split systems, and central heating radiators. The device features an adjustable thermostat, temperature sensor technology, and can be programmed for 5-2 day periods with 3 periods per day. The wall-mounted unit has a digital control style and is powered by a 3V button cell battery. It was manufactured in 2000 and is not compatible with smart home protocols. The Sunvic SunPro 2000 programmer is a perfect addition to your heating, cooling, and air system, providing you with the flexibility to control your environment.