The ESI 5 Series Programmable Room Thermostat is a sleek and efficient device designed for central heating radiators. With a 7-day programmable schedule and digital control style, this thermostat offers convenient and precise temperature adjustments. Its white square shape and childproof resistance properties make it both practical and safe for home use. The thermostat is powered by AA batteries with a 3-year manufacturer warranty, ensuring reliable performance and peace of mind. With its frost protection and proprietary smart home protocol, the ESI ESRTD 5 series is a dependable choice for maintaining a comfortable home environment.