ACCURACY DESIGN: High accuracy for temperature.16000 points large permanent data storage and adjustable recording interval. EASY TU USE: Easy to download data management to computer via USB interface. The data can be queried, saved, printed and exported in Word/Excel/TXT format. ALARMDESIGN: Buzzer Alarm: When the temperature data exceeds the set value, a buzzer alarm will be sent immediately. POWER SUPPLY: Two types of power supply for long life, CR2450 battery (not included) and USB interface. MULTIFUNCTIONAL: Temperature detection can be used in all areas of warehousing, logistics and cold chain, such as refrigerated container, refrigerated truck, refrigerated container, cold store, laboratory, etc. Specification: Material: ABS Color: as pictures shown Temperature measurement range: -30+~+60 for optional external sensor : -40 + ~ + 85 Accuracy: 1 Resolution: 0.1 Ambient temperature: -30 + ~ + 60 Recording capacity: 16000 points (MAX) Sensor: Internal NTC -Thermal resistance Communication interface: USB interface Power supply: CR2450 battery / USB interface Size: 84 * 44 * 20mm / 3.3 * 1.7 * 0.8in Package List: 1 * Temperature Logger (Battery Not Included) Cable 1 * external sensor 1 * user manual