Features Large digital LCD display that provides clear readings Measuring range is 30~130dB, with indicator flashing and buzzer alarm function The device can measure internal or external noise There are hanging holes in the back, which can be hung on the wall to save space. Can be used in measuring noise of various occasions and appliances such as factory, office, home, traffic route, acoustics, air-condition, refrigerator, 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 Storage Temperature and Humidity: -10~60℃ 10~70% RH Weight: Approx. 608g / 21.8oz Size: Approx. 210 * 130 * 30mm / 8.3 * 5.1 * 1.2in   Package List: 1 * Sound Level Meter 1 * User Manual 1 * USB Cable Package List 1 * Sound Level Meter 1 * User Manual 1 * USB Cable