Zigbee wireless connection, no wiring required Monitors temperature, humidity, and atmospheric pressure in real time Remote monitoring: When the room temperature exceeds or falls below a set threshold, the sensor can send a push alert to your phone or trigger other compatible devices Home automation: The sensor can help control other connected devices, such as smart plugs, to maintain desired comfort levels Accurate measurement: Features a high-quality sensor from Sensirion This sensor requires a compatible gateway (sold separately), such as the Aqara Hub or Xiaomi Multifunctional Gateway, to operate The Aqara Hub is required for HomeKit compatibility Wireless protocol: Zigbee Temperature range and accuracy: -20°C to +50°C, ±0.3°C (-4°F to +122°F, ±0.5°F) Humidity range and accuracy: 0–100% RH (non-condensing), ±3% Atmospheric pressure range and accuracy: 30 kPa–110 kPa, ±0.12 kPa Compatible apps: Apple Home app (iOS 10.3 or later), Aqara Home app (Android 5.0 or later, iOS 10.3 or later), Mi Home app Built-in atmospheric pressure sensor Works with HomeKit and Mi Home No wiring required Temperature and humidity alerts Up to 2 years of battery life Requires an Aqara Hub Color: White Material: Plastic Package contents: 1 × Temperature and Humidity Sensor