This dry contact smart thermostat has been developed to be able to control your underfloor heating and cooling from anywhere via your smart phone.  Item No.: WT-20 Programmability: 7days 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, WiFi optional, Zigbee optional Cetificate: CE, ROHS, UKCA, REACH, RED