Temperature measuring range: -30 Celsius ~+70 Celsius ; Resolution: 0.1 Celsius Accuracy: +/- 0.5 Celsius (-20 Celsius ~+40 Celsius); others, +1 Celsius Temperature unit: Celsius or Fahrenheit optional Record capacity: 32000 points (MAX) Record interval: 10s~24hour adjustable Sensor: Internal NTC thermal resistor Communication interface: USB interface Waterproof grade is IP67 Power supply: CR2032 battery or power supply via USB interface, and it could upload data even if the battery is out of use. Battery life: in normal temperature, if the record interval sets as 15 minutes, it could be used above one year. Item Size: approx. 80 (L) x 34 (W) x 14 (H) mm Item Weight: approx. 150g Material: Plastic Package Content: 5 x Data Logger 5 x CR2032 battery (Installed inside) 5 x Software installation CD 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.