Features There are hanging holes on the back, which can be hung on the wall to save space. Large digital LCD display for clear reading. The device can measure internal or external noise. The measurement range is 30~130dB, with indicator light flashing and buzzer alarm function. It can be used for noise measurement of various occasions and electrical appliances such as factories, offices, homes, traffic routes, audio, air conditioners, refrigerators, etc. Features: -There are hanging holes on the back, which can be hung on the wall to save space. -Large digital LCD display for clear reading. -The device can measure internal or external noise. -The measurement range is 30~130dB, with indicator light flashing and buzzer alarm function. -It can be used for noise measurement of various occasions and electrical appliances such as factories, offices, homes, traffic routes, audio, air conditioners, refrigerators, etc.   Specification: Condition: 100% Brand New Model: SW-525A Measuring Range: 30-130dB(dB) Accuracy: ±1.5 dB (In standard sound 94db @ 1khz) Frequency Response: 31.5Hz-8.5khz Frequency Weighting: A Response Time: Fast Microphone: 6 Mm Condenser Microphone Power: DC 5V 1A Micro USB Operating Environment: 0-40℃ 10-80% RH Package List: 1 * Sound Level Meter 1 * User Manual 1 * USB Cable Package List 1 * Sound Level Meter 1 * User Manual 1 * USB Cable