This instrument is mainly used for environmental noise measurement, noise suppression engineering monitoring, quality control, health protection monitoring, etc. Widely used in factories, offices, audio-visual venues, transportation roads, homes, engineering construction and other places that require noise monitoring and control. Features: 1. Large digital LCD display, clear numerical values, easy to read. 2. It is easy to operate and does not require any settings. It can be used immediately upon startup. 3. Measurement range is 30 - 130dB. With upper and lower limit alarms. 4. The adjustable range of alarm time is 5-120 seconds (factory default of 120 seconds). 5. Alarm sound output function. Buzzing to remind you when the real time measurement is reach to the alarm level, and hold the data for 5s then back to normal mode. 6. With hanging holes, can be hangged on the wall. 7. Suitable for checking and monitoring the sound level for personal, families, business, studies, industrial, etc. Specifications: 1. Measurement Range: 30-130dB 2. Frequency Response Range: 31.5Hz-8.5KHz 3. Frequency Weighting: A weighting 4. Response Speed: 8 times or second 5. Accuracy: andplusmn 1.5dB (with sound calibrator 94dB 1000Hz) 6. Resolution:andlt 99.9dB: 0.1dB andgt 100dB: 1dB 7. Power Supply Method: DC5V 1A 8. Power Supply Port Style: Type-C 9. Working Temperature: 0-40 10. Working Humidity: 10 percent -80 percent RH 11. Storage Temperature: -10-60 12. Storage Humidity: 10 percent -70 percent RH Material: ABS Item Size: 22.5 x 12.5 x 3 cm or 8.86 x 4.92 x 1.18 inch Item Weight: 440g or 15.52oz Package Size: 24.5 x 16.9 x 3.5 cm or 9.64 x 6.65 x 1.38 inch Package Weight: 600g or 21.16oz Package List: 1 x Noise Meter 1 x Type-C Power Cable 1 x User Manual (English)