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. Specifications: 1. Measurement Range: 30-130dB 2. Frequency Response Range: 31.5Hz8.5KHz 3. Frequency Weighting: A weighting 4. Response Speed: 8 times/second 5. Accuracy: 1.5dB (with sound calibrator 94dB 1000Hz) 6. Resolution: 99.9dB: 0.1dB; 100dB: 1dB 7. Power Supply Method: DC5V 1A 8. Power Supply Port Style: Type-C 9. Working Temperature: 0-40 ? 10. Working Humidity: 10%80% RH 11. Storage Temperature: -1060 ? 12. Storage Humidity: 10%70% RH Material: ABS Item Size: 22.5 * 12.5 * 3 cm / 8.86 * 4.92 * 1.18 inch Item Weight: 440g / 15.52oz Package Size: 24.5 * 16.9 * 3.5 cm / 9.64 * 6.65 * 1.38 inch Package Weight: 600g / 21.16oz Package List: 1 * Noise Meter 1 * Type-C Power Cable 1 * User Manual (English)