This model has selectable Fahrentheit/Celsius display for use in the US, and other countries. Digital automatic code searching function. Easy setting and simple operation. Built-in clock (AM/PM) and ON/OFF timer function (one shot) . Constant room temperature and setpoint temperature display. Background Lighted LCD display so you can use in the dark! Uses two AAA (No.5) alkaline batteries. Programming Instructions and Code List included. Expanded manual available on request. Note: Not suitable for Carrier RV Rooftop A/C systems or Portable A/C units including Window A/C.