X Sense WiFi Thermometer Hygrometer 3 Pack, Smart Temperature Monitor Wireless, Humidity Meter Sensor Remote, with Alert/App Notification, Compatible Alexa, for Greenhouse, Home, Office, STH51

High Precision Measurements: The industrial Swiss-made high-precision sensor ensures ±0.2°C (±0.36°F) temperature accuracy within -20–60°C (-4–140°F) range, and ±2% RH humidity accuracy within 0–100% RH range. 【NOTE】Base Station SBS50 Required. Covers Entire Home: Open-air transmission range to 1,700 ft (500 m) ensures a stable signal, providing timely data updates; perfect for monitoring large units or multi-level homes Free Data Storage: Enjoy free cloud storage; export the past year’s data with no subscription fee; if the network is disconnected, recent data is restored once the network is back Smart Alerts: Sends push alerts to your phone when temperature/humidity goes out of its preset range, and the base station alarm sounds; low-battery warning; adjustable range and ringtone User-Friendly App: 24/7 real-time remote monitoring; view temperature and humidity anytime; curve graph has min, max, and average values for a select interval; supports temperature unit switch (°F/°C)