Quantity: one piece Color: White Measurement 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 (human ear simulation) Sampling Frequency: 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 unit 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, homes, and audio systems. This is an easy-to-use and practical mini sound level meter. It is designed for sound quality monitoring and 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 directly with the press of a button. A handy gadget ideal for monitoring noise pollution, home theater installations, health and safety compliance, vehicle noise testing, etc. The automatic backlight has a light sensor on top of the LCD screen that detects ambient light conditions. The illumination display increases as ambient light conditions decrease. The darker the surroundings, the brighter the illumination. Additionally, it reads in dBA and has a windscreen to filter out unwanted signals. Wide Range of Applications: Widely used in noise measurement, quality control, health, and various environmental noise measurements, such as residential areas, industrial and mining facilities, schools, office buildings, airports, transportation, waiting rooms, and other occasions. your environment