Steps for Use 1Install 2 batteries (AAA * 2) 2Press the power button for one second to turn on the power 3Press the mode button to switch the temperature measurement mode 4Place the thermometer in the position corresponding to the mode 5Press the power button for 1 second to quickly measure NOTE 1. The normal body temperature of an adult is about 37 ° C (98.6 ° F), and above 37.6 ° C (99.68 ° F) is a fever. But each body type is different. Some people are high or low temperature, so it is normal when the temperature is 35℃- 37.5 ℃(95 ℉-99.5℉） 2. Each measurement needs to be more than 1 minutes apart will more accurate 3. Each measurement needs to be performed at the same location to get your normal body temperature. There will be difference at different locations. That means the results of each measurement will be different. Secondly, you can observe your temperature continuously. If in doubt, you can contact your doctor. 4: Accuracy: Ear & Forehead mode: ±0.2℃ /±0.4°F Object mode: ±0.1℃ /±0.2°F 5. Operating Conditions: 50°F to 104°F (10°C to 40°C) Measuring distance: 0.39in-1.18in (1-3cm) 6. Automatic shutdown: About 15s