Features: Non-contact infrared measurement, reduces the risk of cross infection. Automatically reads a body temperature within ±0.2 degree accuracy and shows instant results in less than 1 second. Aiming towards the forehead with the distance of 10-50mm. Memory function, can store group of data, convenient to view the body temperature changes. Red screen flashes when the temperature is abnormal. Various simple installation methods: wall mounting, double-sided adhesive tape, bracket fixed. Specifications: Item type: Thermometer Measuring Distance: 10-50mm Measuring : 32℃~43℃ （89.6℉~109.4℉） Power-Supply: DC 5V(3 AA batteries)/ 1*18650/ USB (not included batterys) Response-time: ≤1 second Operating Environment: Temperature 16℃~35℃（60.8℉~95℉); Relative humidity: ≤80% Installation Method: Wall hanging, double-sided adhesive tape, bracket fixed Package size: 155*102*65mm/6.1*4.02*2.56in Package weight: 251g/8.85oz Packing List: 1*Thermometer 1*Manual 1*USB Cable 2*Screw