°C and°F Adjustable - Press and hold for 8 seconds to bring it into adjustment mode. Release and press the " Operation" button again to toggle between °C and °F. Maintenance Free: Using 2 standard AAA battery (Not Included). Intelligent power saving features automatically shut down after 60 seconds of standby. Ease of Use: This thermometer can measure the temperature of ear and forehead. Suitable for adult and kids. Ultra light weight, anyone can operate it. Simple point, click and get a peace of mind. Measurement Range - 89.6°F~108°F Designed for Human Body Temperature. Automatically indicating HI or LO when used out of range. Accuracy & Speed: Equipped with state of art microchip and a high sensitivity sensor. Range of accuracy +/-0.4°F. With a single button, you will get an accurate reading within 1 second. Also includes fever warning feature.