Battery-powered with a 2-wire connection to the boiler. Provides flexibility with universal operation and optional smartphone control. Includes manual override facility, backlit LCD display, frost protection and holiday mode. Works with iOS & Android Apps 5-30°C Temperature Range Suitable for Combi Boilers 2-Wire Installation Mains or Battery-Powered Backlit LCD Display 7 Day, 5/2 Day or 24 Hour Programmable 3 Pre-Set Programmes 8 On / Off Periods per Day Boost Facility Works with iOS & Android Apps 5-30°C Temperature Range Suitable for Combi Boilers 2-Wire Installation Mains or Battery-Powered Backlit LCD Display 7 Day, 5/2 Day or 24 Hour Programmable 3 Pre-Set Programmes 8 On / Off Periods per Day Boost Facility