Thermometer working conditions :ambient temperature:16-35℃ relative humidity:≤85% Heat balance time:30 minutes Measuring position:forehead Measuring distance:1-3cm Measurement accuracy:±0.2℃ Temperature measurement range: 0-100℃ Automatic memory:50 groups Automatic poweroff:≤18 seconds Product weight: 86 grams(without battery) Product size:length138 mm x width 95mm x height 40mm Voltage power supply:DC3V (two AAA alkaline batteries)