It's a compact thermometer that doesn't need a battery, but just link to your phone and you can use it.Features:Made of fine quality materials, practical and has a long service life.With LED screen, you can read clearly.C/F can be converted with one click, and the thermometer can be used for different reading habits.The temperature can be measured in a very short time without contact. Safety and health.Instead of a traditional thermometer, the body is thinner, the size of a car key, and easier to carry.With fine sensors, the data is accurate.Specifications:Material: plasticMeasuring ranges: 32C~42CAccuracy: body temperature mode 0.2CMeasurement distance: 10-80mmMeasurement time: 1 secondsEnvironmental conditions: 10C~35COperating humidity: 85%Accuracy/body temperature mode:Within ranges 32.0 -42.9:0.2Out of ranges 32.0-42.9:0.3Power supply: USB Input direct current 5V