Specifications: Range (body surface function): 32.0 ° C ~ 42.5 ° C Temperature accuracy: ± 0.2 ° C for 36 ° C-39 ° C range / ± 0.3 ° C for 32 ° C-35 , 9 ° C range / ± 0.3 ° C for 39 ° C-42.5 ° CMeasurement method: Front / behind the ear without contact Measurement distance: 50mm - 150mmReaction time: 0.5 seconds Over Range Alert: Hi Hi ”For less than 32.0 ° C /“ Lo C ”warning for higher than 42.9 ° CAutomatic shutdown: Shutdown in 7 seconds after not being used Operating temperature: -10 ° C-50 ° Power supply: 2 x AAA batteries (batteries not included). Features: Aiming at the forehead, fast one-second measurement and accuracy. Non-contact measurement, medical grade sensor.