Features: High-precision data logger with low consumption microprocessor for long time monitoring and recording temperature, humidity and atmospheric pressure. With advantage of water resistance(IP67), great storage capacity, automatic storage, USB data transmission and graphic upper computer management. The measured data can be displayed in graphs and you can clearly view the trend of temperature, humidity and atmospheric pressure during a period. With a USB interface, it is convenient to connect with your computer. With the software in the CD, you can make basic settings and view the data on the computer. 2 indicators: "REC" and "ALM". "REC" light in green to show working condition; "REC" light in red to show battery condition; "ALM" light in yellow to indicate full storage; "ALM' light in red to give a temperature and humidity warning. With a plastic case to well protect the USB interface. Small in size, light in weight, easy to carry. Suitable for medicine cabinet, transportation or anywhere needed. Specific instruction: https://www.dropbox.com/s/smupfesix7397h9/Ut330EN.pdf?dl=0 Note: After replaced the battery, the logger need time synchronization with the computer before the logger begins to record data. Specifications: Temperature Range: -40C ~ 80C Humidity Range: 0%RH ~ 100%RH (no condensation) Atmospheric pressure Range: 750hPa ~ 1100hPa Temperature Resolution: 0.1C Humidity Resolution: 0.1%RH Atmospheric Pressure Resolution: 0.1hPa Data Storage: 0-60000 Water Resistance: IP67 Power Supply: 1 * 3.6V 1/2AA Battery(not included) Item Size: 12 * 3 * 2cm / 4.7 * 1.2 * 0.8in Item Weight: 50g / 1.8oz Package Size: 11.5 * 10 * 3.5cm / 4.5 * 3.9 * 1.4in Package Weight: 100g / 3.6oz Package List: 1 * USB Data Logger(battery not included) 1 * CD 1 * User ManualChina