NotesAqara Hub is required, sold separately. A secure 2.4 GHz WiFi network connection is required. Aqara M2 or M1S Hub can connect up to 128 devices (*repeater required such as Aqara Smart Plug or Aqara Smart Wall Switch (with neutral)). Remote MonitoringWhen the room temperature reaches or falls below a certain threshold, the Aqara temperature and humidity sensor can send push alerts to your phone or trigger the Aqara Hub night light. Home AutomationAqara Temperature and Humidity Sensor can control other connected devices, such as Aqara smart plugs, to ensure that your fan or humidifier maintains constant comfort for you and your family. Precise MeasurementsUsing high-quality sensors from the industry-leading manufacturer Sensirion.