Offers flexible time settings, ensuring heating is only called for during normal routine. Features large, easy to read backlit display with intuitive layout, simple channel override, display for day, time and on/off period and icons showing status of output channel. Offers Auto, +1hr Boost or Constant On/Off control. 3, 4 or 5-Wire Installation Fits Standard UK Backplate 7 Day, 5 Day & 24 Hour Programmable 1 Pre-Set Programme 1, 2 or 3 On / Off Periods per Day Boost Facility Holiday Mode Backlit LCD Display 3, 4 or 5-Wire Installation Fits Standard UK Backplate 7 Day, 5 Day & 24 Hour Programmable 1 Pre-Set Programme 1, 2 or 3 On / Off Periods per Day Boost Facility Holiday Mode Backlit LCD Display