The Aqara Radiator Thermostat E1 Starter Kit includes two Aqara Radiator Thermostats E1 and one Aqara M2 Hub. The Radiator Thermostat E1 offers a smarter and more comfortable heating control experience for your home, with advanced features like external temperature sensor readings, weather automation, and freezing protection, and is conveniently powered by 2 x AA batteries per thermostat (batteries included). The colorful backlit display, device grouping support, and easy installation make it a popular choice for most radiator valves. The Aqara Hub M2 is their most powerful Zigbee 3.0 hub to date, featuring support for the full range of Aqara Smart Home devices and the latest communication standard, Matter, and is powered using the included Micro-USB cable. Please check radiator compatibility before purchasing. 2x Radiator Thermostat E1, 1x M2 Hub