Application This room thermostat is apply to Residential buildings,Commercial building. Features Large LCD touch screen display, continuous backlight option. Optional 7 day programming and non-programmable Simultaneous heat and cool set point storage. Display of room temperature, set temperature and current time simultaneously. Emergency heat function Fan switch with ON and AUTO functions. Keep user setting during power loss Operates from 24VAC, or from 2 size “AAA” alkaline batteries. Air Filter change Indicator. Low Battery Indicator. Temperature calibration. Optional temperature display of Celsius or Fahrenheit scale Technical data Voltage: Dual Power 24VAC or Battery Powered. Power load: 3A Setting range: 45ºF to 95ºF (7ºC to 35ºC). Accuracy: ±0.5°c Ambient temperature: 30°F to 105°F (0°C to 40°C) Protective housing: IP21 Housing material: PC+ABS Dimensions: 150mm×115mm ×32mm wall mount