Sensitive sensor: 0.5 second response time, non-contact. Noise levels can be measured in any situation, and accurate measurement results are displayed quickly. LCD display: Large backlit LCD display, clear and easy to read at night. Low radiation, reducing eye damage. Accurate measurement: Measuring range 40~130dBA; accuracy +/-1.5dB, resolution 0.1dB. Multi-function: Data storage function; Maximum/minimum sound level measurement; Automatic power off in 15 minutes, automatic alarm when the sound reaches 130 decibels. Power supply: Powered by 9V battery (not included) Features: 1. Frequency range: 31.5Hz~4kHz, range: 40~130dB. 2. Accuracy: 3.5dB (under 94dB, 1kHz reference conditions), resolution: 0.1dB 3. Frequency weighting of sound level: A frequency weighting of sound level 4. Microphone: 1/2 inch polarized condenser microphone 5. Display: LCD screen 6. Display digits: 3-1/2 digits 7. Response speed: 0.5 seconds 8. Time level: fast response (125mS) 9. Alarm function: "OL" will be displayed when the input exceeds the range. 10. Auto-off: Automatically shut down after 15 minutes of inactivity 11. Battery: 9V carbon battery 12. Operating temperature: 0~40 (32~140) Operating humidity: 10~90%RH Storage temperature: -10~60 (14~140) Storage humidity: 10~75%RH 13. Size: 170X58X35 (mm) Note: The data are all measured manually, please allow 1-3cm error due to differences in light and display, there may be some color differences, please refer to the actual item received.