[Sensitive Sensor] 0.5s response time, no contact required. Measures sound levels accurately under various conditions and quickly displays measurement 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: 1.5 dB; Resolution: 0.1 dB. [Multi-Function] Features include Data Hold, Max/Min sound level measurement, 15-minute auto power-off, and an alert when sound reaches 130 dB. [Power Supply] Powered by a 9V battery (included). Sound Level Meter Main Specifications: Frequency Weighting: A Measuring Range: 30 dB 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% R.H. Storage Temperature: -10 C to 60 C (14 F to 140 F) Storage Humidity: 10% to 70% R.H. Dimensions: Approx. 170 mm (L) x 58 mm (W) x 35 mm (H) (6.7 x 2.3 x 1.4 inches) Weight: Approx. 107 g Power Supply: 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 suggests that 85 decibels is the safe exposure limit for up to eight hours per day. Prolonged exposure to high-volume sounds may damage hearing. 20 dB: Very low 40 dB: Soft 60 dB: Moderate 85 dB: Exposure limit 90 dB: Loud 100 dB: Very loud 110 dB: Extremely loud 120 dB: Potentially dangerous Wide Applications: Ideal for industrial and home use. Accurately measures noise from household appliances, pets, urban construction, factories, offices, traffic, and more. Measurement Tips: 1) When used outdoors, use a windscreen to minimize wind interference. 2) Minimize background noise when measuring specific sound sources. 3) Take multiple measurements to ensure consistent and stable readings. Important Notes: 1) Remove the 9V battery if the device will not be used for extended periods. 2) Avoid use in environments with high temperature or humidity.