Specifications: Working environment: Recommended ambient temperature: 60.8 ° F to 95 ° F (16.0 ° C to 35.0 ° C) Power supply voltage: DC 3.0V (2 * AA batteries, not included) Product size: (165 × 46 × 47) mm (length × width × height) Product weight: 93 grams Measurement range: Body temperature mode: 60.8 ° F to 109 ° F (32.0 ° C to 42.9 ° C) Measurement accuracy: 60.8 ° F to 95 ° F ± 0.5 ° F (32.0 ° C to 34.9 ° C ± 0.3 ° C) 95 ° F to 107.6 ° F ± 0.3 ° F (35.0 ° C to 42.0 ° C: ± 0.2 ° C) 107.6 ° F to 109 ° F ± 0.5 ° F (42.1 ° C to 42.9 ° C: ± 0.3 ° C) Measurement distance: 1 cm-5 cm Measurement time: 1 second Display resolution: 0.1 Tri-color backlight: Body temperature mode: 60.8 ° F to 99.1 ° F (32.0 ° C to 37.3 ° C): Green 99.2 ° F to 100.4 ° F (37.4 ° C to 38.0 ° C): orange 100.5 ° F to 109 ° F (38.1 ° C to 42.9 ° C): red Automatic shutdown: 15 seconds Memory function: store 32 sets of data The correct use method is the key to test accuracy, otherwise it may cause measurement errors. To avoid measurement errors.Please follow these tips: 1). When measuring the body temperature, point the infrared forehead thermometer at the center of the forehead (above the eyebrow center) and keep it vertical, with a distance of 1 to 5 cm. Press Measure button, the temperature is displayed within 1s. 2). Before measuring, please make sure that there is no hair, sweat, cosmetics or hats covered. 3). The ambient temperature around the person under test should be stable, and cannot be tested in places with large air flow such as fans and air outlets of air conditioners. Package: 1 * infrared forehead thermometer 1 * Instructions 1 * certificate