Fast & Accurate Monitoring - Detects temperature and humidity with great accuracy. Updates every 2 seconds. (Accuracy: ±0.3 °C, ±3% RH). Home Automation - Automatically turns on/off home electronics when settings fall outside their present ranges. Free Data Storage & Visual Graphics - Records temperature and humidity data and generates periodic data summaries. Up to 2 years’ free cloud data storage, and export at any time. Real-Time Notifications - Receive instant alerts on your phone whenever levels fall outside present ranges. Set up quickly and easily through the free Tapo app. Flexible Installation - Hang it with a lanyard, attach it on a surface with an adhesive or magnet, or simply place it on a desk. Voice Control – Manage your Smart Temperature & Humidity Monitor with voice commands via Amazon Alexa( only can control Temperature) or the Google Assistant. Hub Required: The Tapo Hub is required to support all smart features: Tapo H100 or Tapo H200 (sold separately).