Easy to Use-Just press the trigger to start meassuring body temperature and the result will be out instantly.Power source:2 AAA batteries(not included). No Contact-The infrared technology enables the device to read body temperature without physical contact,thus preventing cross infection. Accuracy-Ideal for forehead and ear readings, and have a slightly small error margin(0.2°C). Built-in Memory-The fever thermometer has built-in memory which can record as many as 32 readings taken at anytime. High Temperature Alarm-When the temperature is below 99.5°F,the thermometer will give out a 'drip' sound and the screen will change orange.When the temperature is higher than 99.5°F,the thermometer will give out three short 'drip' sound and the screen will change red.