Smart Alert Function: Set preset temp and humidity ranges, and receive an app alert immediately whenever levels fall out of that range, which helps you react faster to sudden changes in your greenhouse. High Accurate Monitor: Temp. range: -20~80℃(-4~176℉) , Humidity range: 0-99%. Up to 1s responsive speed always shows you the latest readings. Bluetooth Wireless Connectivity: The wireless temperature sensor uses a high-end Bluetooth 5.0 chip. Easily monitor temperature and humidity data on CozyTime App via Bluetooth. Detecting range is up to 30m (98ft) without obstructions. Free Data Storage And Export: Store a set of data in 5 minutes intervals, support up to 100 days data storage. One smart device can be connected up to unlimited number of temperature sensors simultaneously. Pocket-sized Design: With a compact and design. Perfect for monitoring home, pets, refrigerators, freezers, walk-in cooler, wine cellars, etc. CR2032 battery lifespan is about 1 year and can be replaced by yourself., Weight: 0.1763698096 pounds, Manufacturer: Oewwthy