Functions Description - F1: when the body temperature exceeds alarm temperature(default value is 38°C), will display red backlight and alarm - F2: calibration(default 0), you can set when there is a temperature deviation - F3: alarm switch(ON-OFF), when turn on the alarm, the screen will appear loudspeaker icon - F4: modes selection(default BODY), the screen will display "Body temp" under BODY mode Backlight Color Description(ONLY BODY MODE) - F1: red backlight: body temperature exceeds F1 and alarms Specifications - Material: ABS - Size: 15.6 x 9.4 x 4.2cm / 6.1 x 3.7 x 1.6inch(LxWxH) - Display Resolution: 0.1°C(0.1°F) - Body Temperature Measurement: 32.0-43°C / 90-109.4°F - Ambient Temperature Measurement: 0-60°C / 32-140°F - Accuracy: (+/-)0.2°C(0.6°C error is allowed due to the infrared test and environment effect) - Measurement Distance: 1 to 15cm(within 5cm is the best) - Auto-shutdown Time: About 7s - Power Supply: 2 * 1.5V AAA Batteries(NOT Included) - Operating Temperature: 10-40°C / 50-104°F - Storage Temperature: 0-50°C / 32-122°F - Relative Humidity: 85%