Quantity: one piece Color white Measuring range: 30-130 dBA Accuracy: 1.5 dB Numbers and resolution: 4 bits and 0.1 dB Frequency response: 31.5 Hz - 8.5 KHz Frequency weighting characteristic: A (human ear simulation) Sampling frequency: 2 times or second Microphone: 1 or 2 inch condenser microphone Power supply: 9V battery Product size: 57x26x149mm Product net weight: 144 grams (battery included) The device is designed to meet the measurement requirements of safety engineers, healthcare, industrial safety offices 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 monitoring, it measures sound levels from 30 dBA to 130 dBA. It features auto-ranging, wide measurement and frequency range (31.5 Hz - 8.5 KHz), maximum sustain, frequency-weighted A, and auto 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, etc. The automatic backlight features a light sensor on top of the LCD screen that detects ambient lighting conditions. The lighting display increases as ambient lighting conditions decrease. The darker the environment, the more intense the lighting. Additionally, it reads in dBA and provides a windshield to filter out unwanted signals. Wide range of uses: widely used in noise measurement, quality control, health 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