Widely used to monitor sound levels with a measurement range from 30 to 130 decibels, accuracy 1.5 dB, frequency response range 31.5 Hz - 8.5 kHz Large LCD display screen, accurate to one decimal place, and easy to read from a distance Multifunctional usage; when the measuring value exceeds the alarm threshold (30 - 130 dB), the meter emits a beeping sound and displays the data Hanging design suitable for various environments such as factory, office, home, hotel, restaurant, library, shopping mall, and traffic routes Audio output allows connection of an external speaker; alarm can be triggered when sound exceeds a set value Specification: Material: Plastic Measurement range: 30 - 130 dB Accuracy: 1.5 dB (reference sound pressure level, 94 dB @ 1 kHz) Frequency response: 31.5 Hz - 8.5 kHz Microphone: 6 mm condenser microphone Power supply: DC 5V 1A via micro USB Working environment: 0 - 40 C (32 F to 104 F), 10 - 80% RH Storage temperature and humidity: -10 C to 60 C, 10% to 70% RH Overall dimensions (L x W x H): approx. 210 mm x 130 mm x 28 mm / 8.26 x 5.11 x 1.1 inch Package Includes: 1 Piece Hanging Noise Tester