[Sensitive Sensor] 0.5s response time, no contact required. Can measure noise levels in various conditions and quickly display accurate results. [LCD Display] Large backlit LCD screen for easy reading in low light. Low radiation design helps reduce eye strain. [Precise Measurement] Measuring range: 30 to 130 dBA; Accuracy of ±1.5 dB with a resolution of 0.1 dB. [Multifunctional Features] Includes data hold function, max/min sound level measurement, and 15-minute automatic power-off. Alarm activates when sound reaches 130 dB. [Power Supply] Operates on a 9V battery (included). Sound Level Meter – Main Specifications: Frequency Weighting: A Measuring Range: 30 dB to 130 dB Accuracy: ±1.5 dB Resolution: 0.1 dBA Response Time: 0.5 seconds Operating Temperature: 0°C to 40°C (32°F to 104°F) Operating Humidity: 10% to 90% RH Storage Temperature: -10°C to 60°C (14°F to 140°F) Storage Humidity: 10% to 70% RH Dimensions: Approx. 170 (L) x 58 (W) x 35 (H) mm (6.7 x 2.3 x 1.4 inches) Weight: Approx. 107 g Power Source: One 9V battery Main Functions: - Data Hold - Max / Min Display - 15-Minute Auto Power-Off - Large LCD Screen Package Contents: 1 x Digital Sound Level Meter 1 x 9V Battery Noise Level Reference: Government research indicates that prolonged exposure to noise above 85 decibels may lead to hearing damage. 20 dB: Very quiet 40 dB: Quiet 60 dB: Moderate 85 dB: Recommended daily exposure limit 90 dB: Loud 100 dB: Very loud 110 dB: Extremely loud 120 dB: Potentially dangerous Applications: Suitable for both industrial and household use. Accurately measures noise from appliances, pets, construction sites, factories, offices, traffic, and more. Measurement Tips: 1) When measuring outdoors, use a windscreen to minimize wind interference. 2) Ensure minimal interference from surrounding noise sources for accurate readings. 3) Take multiple measurements to obtain a stable average. Important Notes: 1) Remove the 9V battery if the device is not used for extended periods. 2) Avoid using the device in environments with high temperature or humidity.