Sensitive sensor 0.5s response time, contactless operation. Measures noise levels in various environments with quick and accurate results. LCD Display Large backlit LCD screen, clear and easy to read in low light. Low radiation design helps reduce eye strain. Accurate measurement Measurement range: 30 to 130 dBA; accuracy: +/- 1.5 dB; resolution: 0.1 dB. Multifunction Features include data hold, maximum/minimum sound level measurement, auto power-off after 15 minutes, and alarm function when sound reaches 130 dB. Product dimensions: 17 x 5.8 cm. Note: All measurements are taken manually. Please allow 1-3 cm variation due to lighting and display differences. Color may vary slightly depending on screen settings. Please refer to the actual product received.