Temperature measurement range 32 degC - 43 degC (90-109.4 F) Temperature measurement accuracy: ±0.3 degC(0.54F) The reaction time: 0.5 seconds Measuring distance: 3-5 cm (2-5.9 inches) Automatic shutdown time: about 7 seconds Display accuracy: 0.1 degC(0.1 F) The operating environment temperature: 10 degC-40 degC(50-104F) Relative humidity: < 80% Product size: 170 x 80 x 40 mm/6.69" x 3.15" x 1.57" (length X width X height) Battery: 2 x 1.5 V AAA battery (battery is not included)