Type: Digital Temperature Data Logger Power supply: Built-in wide temperature CR2032 button battery or USB interface Material:ABS colour:White + Blue Package Contents: 3 x Digital Hygrometer 3 x English manual Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm. Data Interface: USB Interface Data output: USB socket directly connected to the computer Sensor: Built-in thermistor Instructions for use: long press the key for more than 4 seconds, after the interface shows ▶ sign, it means the instrument start recording. Application: It is mainly used to monitor and record the temperature data of foods, , chemicals, etc. during storage and transportation. It is widely used in all aspects of warehousing, logistics and cold chain, such as refrigerated containers, refrigerated trucks, refrigerated bags, cold storage, Laboratory etc.