About this item Accurate and Fast ResponseUsing accurate and sensitive temperature and humidity sensors it can achieve a temperature error of 0.5 (1) and a humidity error of 5% refreshed once per second this perfect room thermometer hygrometer is the perfect assistant for accurate and fast temperature and humidity measurements. Wireless App ControlWith a high-end Bluetooth 5.0 chip temperature and humidity data can easily be monitored remotely via Bluetooth on an app (free download from the App Store and Google Play). Data Storage and ExportSupports temperature data export function recording a set of data every 10 minutes up to 100 days of data can be stored. One smart device can be connected to 100 temperature sensors at the same time. Free export of data in CSV format after registration of an account. Smart Alarm AlertThe sensor with a buzzer sets off an alarm on the device if the temperature or humidity is out of range. Alert notifications will also be sent to your mobile phone. Portable Design & Universal UseOur wireless temperature and humidity sensors are smaller than others. The CR2477 has a battery life of approximately 1 year and is self-replaceable. Special wall sticker with built-in magnet for placing anywhere; space saving and portable.