This Pro1 T721 thermostat is perfect for controlling your heating and cooling systems. It features a square shape and a 4-inch display size for easy readability. The thermostat is compatible with Alfi brands and can be used with central furnace, heat pump, and central air conditioner systems. It has two heat stages and one cool stage, and the system can be switched between heat, cool, and off modes. The thermostat is also equipped with a temperature sensor technology for accurate readings. It can be mounted on the wall or surface-mounted, and it supports both corded electric and battery power sources. The Pro1 T721 thermostat is an excellent choice for those who want a non-programmable device.