The Honeywell Evohome smart controller is a rectangular-shaped thermostat that offers Wi-Fi and app control features, making it convenient for users to adjust the temperature settings from their smartphones. It is a programmable device that can be set to specific schedules for optimal energy efficiency. The BDR91 Relay Box and hot water kit included in the package ensure the entire heating system is connected and ready to use. With the added benefit of battery-operated functionality, this smart controller is a reliable and efficient choice for maintaining a comfortable home environment.