Description: Widely used to monitor sound levels with a measurment range from 30 to 130 decibels, accuracy ±1.5db, frequency response range 31.5Hz-8.5KHz Large LCD display screen, accurate to one decimal place, and also easy to read in distance Multifunctional usage, when the measuring value is over the alarm value( 30 - 130dB ), the meter will make a sound beeping and display the data Hanging designed to be applied in various occasions like factory, office, home, hotel, restaurant, library, , shopping mall, traffic route etc. Audio Outlet, you can add external speaker by yourself, over a certain value, it can give an alarm Specification: Material: Plastic Measurement range : 30 - 130dB Accuracy: +1.5 dB (reference sound pressure level, 94dB @ 1kHz) Frequency response: 31.5Hz - 8.5kHz Microphone: 6mm condenser microphone Power supply: DC 5V 1A micro USB Working environment: 0 - 40 degrees (32 degrees Fahrenheit to 104 degrees Fahrenheit), 10 - 80%RH Storage of Temp. and humidity: -10~60C. 10~70%RH Overall Size ( L x W x H ): approx. 210mm x 130mm x 28mm / 8.26 x 5.11 x 1.1 Inch Package Includes: 1 Piece Hanging Noise Tester Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Sold by-YJL official store