Quantity: One piece Color: White Measuring Range: 30~130 dBA Accuracy: ±1.5 dB Digits & Resolution: 4 bits & 0.1 dB Frequency Response: 31.5 Hz ~ 8.5 KHz Frequency Weighting Characteristic: A (Human Ear Simulation) 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) This unit is designed to meet the measurement requirements of safety engineers, health, industrial safety offices and sound quality control in various environments, including factories, offices, transportation, home and audio systems. This is an easy-to-use and handy 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, wide measuring and frequency range (31.5 Hz ~ 8.5 KHz), max hold, frequency weighted A and auto backlight. Readings are displayed directly with the touch of a button. A practical gadget ideal for monitoring noise pollution, home theater installations, health and safety compliance, vehicle noise testing, etc. The automatic backlight features a light sensor on top of the LCD that senses ambient light conditions. The illumination display increases as ambient light conditions decrease. The darker the environment, the stronger the backlight will be. In addition, 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 measurement, such as residential areas, industrial and mining plants, schools, office buildings, airports, transportation, waiting rooms and other occasions.