1. Non-contact, temperature measurement distance 1-15CM. 2. Temperature measurement range: 34 -43 degree celsius error ± 0.2 3. Support free switch between Celsius and Fahrenheit. 4. 0.5 second measurement results. 5. Support 50 sets of data storage and comparative analysis. 6. Two AAA1.5V batteries are used for power supply or USB power, power saving setting, and the screen will automatically turn off in 10 seconds.