Digital LCD Noise Level Meter Wall Hanging Noise Tester Description: Measuring range from 30 to 130 decibels (accuracy ±1,5 dB); Data storage function. Large LCD display screen, accurate to decimal place, and also easy to read at a distance Multifunctional application, when the measurement value is an alarm value (30 - 130dB), the meter will make an audible signal and display the data Hanging designed for use on various occasions such as factory, office, home, hotel, restaurant, library, shopping mall, traffic route, etc. Audio output, you can add external speaker yourself, above the specified value, can trigger alarm Specification: Material: Measuring range: 30-130dB Accuracy: 1,5 dB (reference sound pressure level, 94 dB at 1 kHz) Frequency Response: 31,5 Hz - 8,5 kHz Microphone: 6 mm condenser microphone Power Supply: DC 5V 1A; Micro USB Total size (L. x W x H ): approx. mm x mm x mm / 8.27 x 5.12 x 1 inch The package includes: 1 piece hanging noise tester 1 piece instruction 1 piece Warranty card 1 piece USB