Features PORTABLE AND EASY TO USE --- Sound level meters are very small and lightweight, easy to carry and operate. Users can carry a sound level meter for measurement at any time, making it convenient to monitor noise levels in both outdoor and indoor environments. HIGH ACCURACY --- The sound level meter adopts high accuracy measurement technology and sensors, which can accurately measure the sound level in the environment. Users can make decisions based on measurement results, such as choosing a quiet working environ STABLE AND RELIABLE --- Sound level meters are usually able to monitor and display sound levels in real time, allowing users to instantly understand the current noise situation in the environment. This allows users to take timely measures, such as adjusting SCOPE OF APPLICATION --- Decibel meter can be widely used in various fields, such as environmental monitoring, factory safety, building management, traffic noise control, etc. It can be used to measure the sound pressure level of various sound sources, such ABS MATERIAL --- Made of premium ABS material, this sound level meter is strong and sturdy, wear resistant and scratch resistant to withstand different scenes, ensuring a long service life. Specification: Item Type: Sound Level Meter Material: ABS Frequency Weighted Characteristic: A weighted Frequency Response: 31.5HZ to 8KHZ Measurement Range: 30dB to 130dB Response Time: (FAST) 125 milliseconds (SL0W) 1000 milliseconds less than 30dB Overload Indication: Greater than 130dB Accuracy: ± 1.5dB Automatic Shutdown: About 10 minutes Low Voltage Prompt: The battery voltage is below 6V Sensor: 1/2 inch electret condenser microphone Power Supply: 9V 6F22 battery x 1 (shipped without battery) Size: Approx. 192 x 53.8 x 35mm / 7.56 x 2.12 x 1.38in  Package List:1 x Sound Level Meter1 x Manual  Package List 1 x Sound Level Meter 1 x Manual