1、Parameters: The sound level meter has a measurement range of 30 to 130dB, an accuracy of ±1.5dB (reference sound pressure level, 94dB 1KHz), and a frequency response range of 31.5Hz‑8.5KHz. 2、HD Screen, Backlit: The sound level meter features a large 9.6‑inch LCD display with HD backlight, so you can easily read all day at your convenience. 3、Plug and Play: Noise decibel reader is simple to set up, just plug in the power supply and use, DC 5V 1A Micro USB power supply, convenient and fast, plug and play. 4、Data Saving: Noise decibel reader has data export and memory storage functions, after starting, save data every two seconds, data retention for 1 year. 5、Line Chart: The sound meter can be connected to a computer to observe the noise change through the line chart, which is more intuitive. Usually in a very quiet room, this value will not fall below 40dB, which is normal. 6、Alarm Indicator: Sound meter alarm when the indicator flashes, accompanied by beep alarm sound, alarm time adjustable: 6s‑120s, alarm sound adjustable: 1‑3 levels. 7、Widely Used: The back of the sound meter has mounting holes, easy to install, widely used in homes, offices, clubs, college classrooms, hotel rooms, hospital wards, hotels, laboratories and other places.