["Instructions for use:r [1] for DC power supply: This product requires access 4-28V for DC power supply, the red line for positive power supply, the black wire to the negative power. The greatest feature of this product: its own reverse anti-burning circuit, avoiding the user process due to improper operation problems. Friendly reminder: must not be connected with AC 220V Oh!r [2] Display When the temperature sensor is removed when the digital display "- - -", the temperature is below -20 or above 100 , digital also shows "- - -."r [3] Acquisition normal temperature range: -20 to 100 , resolution 0.1 , accuracy of 1 .r r Product Usage:r (1) Measuring the temperature inside and outside the carr (2) Measuring the temperature inside and outside the -conditioned roomr (3) Measuring the temperature inside and outside the refrigeratorr (4) Temperature measurement pondr (5) Baby bath water temperature measurementr r Specifications:r Supply voltage: for DC 4-28Vr Refresh rate: about 1S / timesr Accuracy: 1 r Measuring temperature: -20 ~ 100 r Working temperature: -40 to 80 r Display color: Red + Greenr Sensor Type: 1M NTC waterproof metal prober Display: 0.28 LEDr Minimum resolution: 0.1 r Size: 48x29x18mm/1.89x1.14x0.71"r Quantity: 1 Setr r Note:r Please allow 1-3mm error due to manual measurement.pls make sure you do not mind before you bidr Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you!r r No Retail Packager Package Includes:r 1 x Digital Thermometerr 2 x Waterproof Metal Prober 1 x Power Supply Cable"]