The Aqara Radiator Thermostat E1 Starter Kit includes two Aqara Radiator Thermostats E1 and one Aqara Hub E1. 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 E1, on the other hand, is a powerful yet small smart home hub that supports both classic and the newest Aqara Zigbee devices, offering all-round compatibility with most popular ecosystems and voice assistants, whilst only needing to be plugged into a powered USB port, no batteries required. Please check radiator compatibility before purchasing.2x Radiator Thermostat E1, 1x E1 Hub Features: Connect your Aqara devices across your home and cont