Aube by Honeywell TH141HC-28-B/U Heat and Cooling 7-Day Programmable Thermostat Ideal for: Radiant or convection electrical heating system; Circulator control in a hot water system; Electrical hot air furnace; Hot air, gas or fuel conventional furnace and Air-conditioning system 7-day, up to 4-time periods, 2-temps per day. Selectable 12 or 24-hour format, Degree Celsius or Degree Fahrenheit. (1.5-Ampere at 24-Volt) Remote input enables change of temperature modes from phone (Aube telephone controller required) or alarm and automation system (12 VDC transformer required) Low battery indicator gives 60-day warning to replace battery (2 'AA' batteries required) Dimensions (height by width by depth): 4.9-Inch by 3.8-Inch by 1-Inch