The Humming bird infrared thermometer measures the fever, the primary characteristic of corona virus infection, and enables to detect a corona virus infection from the first step. With the combination of the time-proven MEMS state-of-the art sensing element with a fully integrated A/D converter and an integrated ambient temperature sensor, Hummingbird always delivers an accurate and dependable temperature data. Device Specifications: PRECISION RANGE : 0.2C MEASURING DISTANCE : 2cm ~ 5cm AUTO POWER OFF : 10 sec �?�± 1 sec MEASUREING PROCESS : LED Lamp + Buzzer BATTERY : Changeable for two 3V triple A batteries BATTERY LIFE : More than 2,500 times OPERATION TEMPERATURE : 20C ~ 40C STORAGE TEMPERATURE : -10C ~ 60C DIMENSION : 40(W)mm x 70.8(D)mm x 153(H)mm