Preferred Material: The sound level meter is made of high quality ABS material, which makes it last longer. The sound level meter has a low battery reminder function and will automatically turn off when not in use for a long time to save energy. Sound level meters are suitable for use in many different areas of the spectrum, such as music recording, neighbor noise complaints, industrial environments, etc. The sound level meter has an automatic backlight display for easy viewing in dark conditions. The sound level meter can display, measure the absolute high and low peak decibels (maximum and minimum), and change the display. Measuring range: 30 ~ 130 dBA Accuracy: 1.5 dBA Number of digits and resolution: 4 digits and 0.1 dB Frequency response: 31.5HZ~8kHZ Operating temperature and humidity: 0~40, 10~80%RH. Storage temperature and humidity: 10~60, 10~70%RH. Sampling rate: 2 times/second Microphone: 1/2 inch condenser microphone Frequency weighting characteristics: one weighting Max/Min Automatic sensor backlight Low battery prompt Automatic shutdown Power supply: 9V battery (not included) Product size: 57*36*149mm Note: The data is All measured manually, please allow 1-3cm error Due to differences in light and display, there may be some color differences, please refer to the actual item received.