Smart Thermostat For ENGO Heating Systems: Zigbee wireless room thermostat for ENGO smart heating control, suitable for underfloor heating or radiator heating with compatible ENGO devices Underfloor Heating Or Radiator Control: Works with an ENGO control box to control underfloor heating zones, or with ENGO smart radiator valves such as the ETRV-M30 App Controlled Thermostat: Schedules, timers and automation are set in the ENGO Smart app via the E-Gate Pro gateway. Without a gateway it still runs in day mode, with no schedule, from its own buttons ENGO Gateway For Smart Features: An ENGO gateway such as the E-Gate Pro (sold separately) adds the ENGO Smart app, schedules, wireless binding, and Alexa or Google Home voice control via the app. Day mode and the wired relay work without one. Not for generic Zigbee hubs Two Wireless Radios: ZigBee 3.0 (2.4 GHz) plus a separate 868 MHz radio. The ENGO control box link uses ZigBee 3.0, and up to 6 ENGO smart radiator valves in the same room pair directly, with no gateway needed 230V Mains Powered Installation: Powered by 230V AC, suitable for replacing a wired wall thermostat in a permanent installation