Meross Smart Thermostat for Boiler/Water System Compatible with most boiler/water heating systems. Control from anywhere with internet anytime. Works with Apple HomeKit, Amazon Alexa, Google Assistant, and SmartThings. 0.5℃ temperature accuracy with an adjustable temperature of 5-35℃. Pure white LED backlight, covered by elegant glass panel. Minimalist design that fits any decoration style. Save your heating cost with a 7×24 hours smart graphic schedule. Never worry about arriving home with a cold room, or leaving the house with the system heating. Open window detection function. Automatically stop heating when the open window is detected. Save more on your heating bill. Integrated and external dual temperature sensor system, either one of them can be used for temperature control.