Using this thermometer is a breeze. To measure temperature, simply hold the thermometer within an inch of the forehead or the liquid you want to measure, and you'll get a reading in less than a second. Remember, the maximum measuring distance is 1 inch. The indicator light will tell you if the body temperature is high (red) or normal (green). You can switch between Fahrenheit and Celsius according to your preference. It stores the last 30 temperature readings, which can be useful for tracking changes. As for maintenance, keep it clean with a soft, dry cloth. Since it has auto - power off, you don't have to worry about draining the battery. The battery can last up to 1 year, but when it's time to replace it, make sure to use the recommended type. This thermometer is FDA Certified, so you can trust its accuracy and safety for your family.