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