This data logger is used to record temperature data over a long period of time. Mainly used for temperature recording during storage and ocean/air/highway transportation of foodstuff, medicine, chemicals and other products. Features: 1. High accuracy for temperature.16000 points large permanent data memory and adjustable record interval. 2. Easy to download data management to computers through USB interface. The data could be queried, saved, printed and exported in Word/Excel/TXT format. 3. Buzzer alarm, if the temperature data exceeds the set value, it will immediately send a buzzer alarm. 4. Two kinds of power supply for long life service, CR2450 battery(not included) and USB interface. 5. Temperature recording can be widely used in all links of warehousing, logistics and cold chain, such as refrigerated containers, refrigerated trucks, refrigerated package, cold storage, laboratory, etc. Specification: Condition:100% Brand New Material: ABS Color: As Pictures Shown Temperature measuring range: -30~ 60 for optional external sensor: -40~ 85 Accuracy: 1 Resolution: 0.1 Ambient environmental temperature: -30~ 60 Recording Capacity: 16000points (MAX) Sensor: Internal NTC thermal resistor Communication interface: USB interface Power supply: CR2450 battery/USB interface Battery life: in normal temperature, if the record interval sets as 15 minutes, it could be used above one year. Size: approx.84*44*20mm/3.3*1.7*0.8in Weight: Approx.96g/3.4oz Package list: 1 * Temperature logger(Not inlcuded Battery) 1 * USB Cable 1 * External Sensor 1 * User Manual Note: 1. Please allow 0~1 inch error due to manual measurement. Thanks for your understanding. 2. Monitors are not calibrated same, item color displayed in photos may be showing slightly different from the real object. Please take the real one as standard.