[Sensitive sensor] 0.5s response time, non-contact measurement. Capable of measuring noise levels in various environments and displaying accurate results quickly. [LCD display] Large backlit LCD screen, easy to read in low-light conditions. Low radiation design for reduced eye strain. [Precise measurement] Measuring range: 30–130 dBA; Accuracy: ±1.5 dB; Resolution: 0.1 dB. [Multi-function] Data hold function; Max/Min sound level measurement; Auto power-off after 15 minutes; Alarm function activates at 130 dB. [Power supply] Powered by a 9V battery (included). Sound Level Meter – Main Parameters Frequency weighting: A Measuring range: 30 dB–130 dB Accuracy: ±1.5 dB Resolution: 0.1 dBA Response time: 0.5 second Operating temperature: 0°C–40°C (32°F–104°F) Operating humidity: 10%–90% RH Storage temperature: −10°C–60°C (14°F–140°F) Storage humidity: 10%–70% RH Dimensions: Approx. 170 mm (L) × 58 mm (W) × 35 mm (H) (6.7 in × 2.3 in × 1.4 in) Weight: Approx. 107 g Power supply: 9V battery Main functions Data Hold Max / Min Display 15-minute auto power-off Large LCD screen Package includes: 1 × Digital sound level meter 1 × 9V battery Government guidelines suggest that prolonged exposure to noise above 85 decibels may pose a risk to hearing health. 20 dB: Very quiet 40 dB: Quiet 60 dB: Moderate 85 dB: Recommended exposure limit (8 hours) 90 dB: Loud 100 dB: Very loud 110 dB: Extremely loud 120 dB: Potentially hazardous Applications include measuring noise from household appliances, urban traffic, construction sites, offices, industrial environments, musical instruments, and more. Measurement tips: 1) When measuring outdoors, use a windscreen to minimize wind interference. 2) Ensure the target sound source is dominant and minimize background noise influence. 3) Take multiple measurements to obtain a stable and representative reading. Important notes: 1) Remove the 9V battery if the device will not be used for an extended period. 2) Avoid use in high-temperature or high-humidity environments.