This is a surface-mounted, easy installated wired boiler thermostat. With it's attractive touch screen user interface makes your home looks more fashionable.  Item No.: HT-20 Programmability: 7 days programmable Mode: Heating and cooling mode(Default heating mode) Backlight: Black Material:  ABS+PC Packing : Netural White Box, OEM acceptable Other function: Child lock, Open window detection, Frost protection, Temp. calibration  Optional: Opentherm protocol Cetificate: CE, ROHS, UKCA, REACH