This instrument is designed for environmental noise measurement, noise monitoring, quality control, and health protection applications. It is commonly used in factories, offices, outdoor venues, transportation areas, homes, and construction sites where noise monitoring is required. Features: 1. Large digital LCD display with clear numerical values for easy reading. 2. Simple to operate with no setup required—ready to use upon startup. 3. Measurement range from 30 to 130dB, with upper and lower limit alarms. 4. Adjustable alarm duration from 5 to 120 seconds (factory default set to 120 seconds). 5. Built-in alarm sound output; buzzer activates when real-time measurement reaches the alarm level, holds data for 5 seconds, then returns to normal mode. 6. Equipped with hanging holes for wall mounting. 7. Suitable for personal, family, business, educational, and industrial sound level monitoring. Specifications: 1. Measurement Range: 30–130dB 2. Frequency Response Range: 31.5Hz–8.5kHz 3. Frequency Weighting: A-weighting 4. Response Speed: 8 times per second 5. Accuracy: ±1.5dB (with sound calibrator at 94dB, 1000Hz) 6. Resolution: 1dB at 100dB 7. Power Supply: DC5V 1A 8. Power Port: Type-C 9. Operating Temperature: 0–40°C 10. Operating Humidity: 10%–80% RH 11. Storage Temperature: -10–60°C 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)