Model:WK-168 Measurement Method, Non-contact Measurement - Distance 1cm-3cm Measuring Range Body Temperature:32.0 C-42.9 C (89.6 F~109.2 F) Surface Temperature: 0 -60 (32.0 - 140.0) Maximum permissible error: 35 -42 ±0.2 0 -34.9 and 42.1 -60 ±1 Resolution of display:0.1C Operating environment:10-40 , 50 -104 humidity: 15%~85% Transport/Storage Environment:-20 C-60 C (-4 T-140 7); humidity 95% Power Source:DC9V ±0.9V Battery Notification:Low Battery Notification Backlight - High-luminance Backlight Unit:C/F Auto Shutdown 20 seconds Dimension - 168mmx100mmx35mm Weight - 135g (excluding battery)