Quantity: One piece Color: White Measuring range: 30~130 dBA Accuracy: 1.5 dB Digits and resolution: 4 bits and 0.1 dB Frequency response: 31.5 Hz ~ 8.5 KHz Frequency weighting characteristic: A (simulation of the human ear) Sampling rate: 2 times/second Microphone: 1/2 inch condenser microphone Power supply: 9V battery Product size: 57*26*149mm Product net weight: 144 grams (including battery) The device is designed to meet the measurement requirements of safety engineers, health, industrial safety bureaus and sound quality control in a variety of environments, including factories, offices, transportation, home and audio systems. This is an easy-to-use and practical mini sound level meter. Designed for sound quality control, it measures sound levels from 30 dBA to 130 dBA. It features auto-ranging, a wide measurement and frequency range (31.5 Hz ~ 8.5 KHz), maximum hold, frequency-weighted A, and automatic backlight. Readings are displayed instantly at the touch of a button. A handy gadget ideal for noise pollution monitoring, home theater installations, health and safety compliance, vehicle noise testing, and more. The automatic backlight has a light sensor on top of the LCD display that detects ambient lighting conditions. The illumination display increases as ambient lighting conditions decrease. The darker the environment, the brighter the illumination. Additionally, it reads in dBA and provides a windscreen to filter out unwanted signals. Wide range of uses: Widely used in noise measurement, quality control, health monitoring and various environmental sound measurements, such as residential areas, industrial and mining plants, schools, office buildings, airports, transportation, waiting rooms and other occasions.Good quality product