It is a Red/Blue/Green Digital Thermometer,Measuring temperature Range -50 ~ 110 °c,Power Supply DC 12V (DC4.5-15V), it has Reverse polarity protection ,small size, high efficiency, long term stable and reliable quality,easy installation and use, Applied to the Indoor, Outdoor, Car,Water, Refrigerator, Aquarium, home, factory, garden, And other platforms.