Comprehensive Accurate Measurements: This decibel meter is specially designed to provide accurate noise level measurements from 30dB to 130dB. The device has a high accuracy of 1.5dB, ensuring that you can obtain accurate data in different environments. Fast and slow response switching: This device has a frequency response of 31.5Hz-8.5KHZ and a sampling frequency of 2 times/second. It is specially designed for large-changing noise environments and can more accurately track changes in noise levels. Optimized visual display: Equipped with a large backlit LCD display for clear readings even in low-light environments. When the battery power is low, the screen automatically display a low battery prompt to remind the user to replace the battery in time. Wide range of application scenarios: The decibel meter is not only suitable for noise engineering and product quality control, but also an perfect choice in of health prevention and treatment. Its portable design and wide range of applications an perfect noise measurement tool for private, home, school, industrial and other occasions. Power Supply:3 x AAA battery(Not included batteries) Colour:As Shown Material:Plastic Package Contents: 1 * decibel meter Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.