ZigBee wireless connection, no wiring required REMOTE MONITORING: When the room temperature reaches above or below a certain threshold, the Aqara Temperature and Humidity Sensor can send a push alert to your phone or trigger other devices. HOME AUTOMATION: The Aqara Temperature and Humidity Sensor can control other connected devices such as Aqara Smart Plug to ensure that your fan or humidifier maintains a constant level of comfort for you and your family. ACCURATE MEASUREMENT: Utilizes high-quality sensor from the industry-leading manufacturer, Sensirion. 1. This sensor must match the xiaomi multifunctional gateway or Aqara gateway hub ( need to be purchased separately ) to use. 2. Aqara gateway hub is required to make this sensor to work with HomeKit. Wireless Protocol: Zigbee Temperature Range and Precision: -20℃-+50℃, ±0.3℃ (-4℉-+122℉, ±0.5℉) Humidity Range and Precision: 0 - 100% RH (non-condensing), ±3% Atmospheric Pressure Range and Precision: 30 kPa - 110 kPa, ±0.12 kPa App: 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 AIR PRESSURE SENSOR: Monitors the ambient air pressure in the room. Can work with Homekit, Mi Home Monitors temperature, humidity, and atmospheric pressure in real time. No Wiring Required/Temperature and Humidity Reminder/2 Years Battery Life An Aqara hub is required. Note: Please check as much as possible to make sure the item is what you need. Tips: The product may be updated constantly ,Due To Different Batches, The Actual Product May Have Slight Differences Or Color Differences, Which Does Not Affect Use. Colour:White Material:Plastic Package Contents: 2 x Temperature and Humidity Sensor Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.