Features ​BUILT-IN STORAGE FUNCTION: Indoor hygrometer thermometer with built-in storage function, equipped with Bluetooths 5.0 technology and APP, records temperature and humidity data every 10 minutes, the data can be exported to CSV file and can be shared with friends. HIGHLY ACCURATE MONITORING: Electronic temperature humidity meter monitor adopts MEMS digital temperature and humidity sensors with a refresh rate of 1 second/time, which is able to accurately and stably monitor the temperature and humidity of the environment. ABS MATERIAL: Bluetooths hygrometer is made of excellent ABS material with built-in battery, sturdy and wear-resistant, not easy to be damaged, long service life. COMPACT AND CONVENIENT: The Wireless thermometer is small and lightweight enough to fit in your pocket, and the top rope hook design allows you to hold it on a key chain or wall without taking up too much storage space. WIDE APPLICATIONS: Digital thermometer hygrometer has a wide range of applications, can be used in nurseries, offices, greenhouses, pharmacies, agricultural planting, warehouses and so on. Features: BUILT-IN STORAGE FUNCTION: Indoor hygrometer thermometer with built-in storage function, equipped with Bluetooths 5.0 technology and APP, records temperature and humidity data every 10 minutes, the data can be exported to CSV file and can be shared with friends. HIGHLY ACCURATE MONITORING: Electronic temperature humidity meter monitor adopts MEMS digital temperature and humidity sensors with a refresh rate of 1 second/time, which is able to accurately and stably monitor the temperature and humidity of the environment. ABS MATERIAL: Bluetooths hygrometer is made of excellent ABS material with built-in battery, sturdy and wear-resistant, not easy to be damaged, long service life. COMPACT AND CONVENIENT: The Wireless thermometer is small and lightweight enough to fit in your pocket, and the top rope hook design allows you to hold it on a key chain or wall without taking up too much storage space. WIDE APPLICATIONS: Digital thermometer hygrometer has a wide range of applications, can be used in nurseries, offices, greenhouses, pharmacies, agricultural planting, warehouses and so on. Specification: Item Type: Hygrometer Thermometer Material: ABS Battery Type: Coin Cell CR2477 x 1 ( Shipped With Built In Battery ) Battery Capacity: 1000mah Package List:1 x Hygrometer Thermometer1 x Card Removal Needle1 x Manual Package List 1 x Hygrometer Thermometer 1 x Card Removal Needle 1 x Manual