Feature: 1. 9.5\" super large full screen LCD with large bold red font to display for easy reading. 2. 24 hours real-time monitoring the sound level. 3. Support hanging on the wall(recommended) or free standing on the desk. 4. Wide measurement range from 30dB to 130dB, Frequency: 31.5Hz - 8KHz, Resolution: 0.1dB/1dB, Accuracy: ±1.5dB. 5. With A and C equivalent weighted sound pressure levels. 6. Fast and slow dynamic characteristic mode. 7. With maximum/minimum value measurement. 8. 9.5\u0027 super large full screen LCD with large bold red font to display for easy reading. Specification: Material: ABS Measure Range: 30-130dBA, 35-130dBC Frequency Response: 31.5Hz-8.0kHz Accuracy: ±1.5dB (refer to sound calibration frequency, 94dB at 1KHz) Frequency Weighting: A or C weighting Digital Display: 3 large LED digital display Resolution: 0.1dB<100dB, 1dB>100dB Display Mode: Fast and slow selectable Microphone Type: Dia. 6mm ECM type Alarm Mode: Built in alarm buzzer Operation Voltage: USB DC5V 1A Operating Temperature and Humidity: 0-40℃, 10%-80%RH Storage Temperature and Humidity: 0-60℃, 10%-70%RH Power Supply: 5V 1A AC DC adapter Item Size: Approx. 221x120x32.5mm / 8.7x4.7x1.3in Item Weight: 518g / 18.28oz. Package List: 1 x Sound Level Meter 1 x USB Cable 1 x User Manual(English)2 x Support Rack