Features: Large Full-Screen LCD Display: Features a 9.5-inch large full-screen LCD display with large bold RED fonts for easy reading. Real-time Monitoring: Provides 24-hour real-time monitoring of sound levels. Versatile Placement: Can be hung on the wall (recommended) or placed independently on the table. Wide Measurement Range: Offers a wide measurement range from 30dB to 130dB, with frequency ranging from 31.5Hz to 8KHz. Resolution is 0.1dB/1dB, and accuracy is +/-1.5dB. Weighted Sound Pressure Levels: Supports A and C equivalent weighted sound pressure levels. Dynamic Characteristics Mode: Features fast and slow dynamic characteristics mode for varying measurement needs. Maximum/Minimum Value Measurement: Provides maximum and minimum value measurement capabilities. Alarm Function: Alerts with a buzz and flash when the real-time measurement reaches the alarm level, returning to normal mode after holding the data for 3 seconds. Wide Application: Suitable for checking and monitoring sound levels in homes, schools, offices, music rooms, shopping malls, industries, etc. Specifications: Material: ABS Measurement Range: 30130dBA, 35130dBC Frequency Response: 31.5Hz~8.5kHz Accuracy: +/-1.5dB (reference sound calibration frequency, 94dB@1KHz) Frequency Weighting: A or C weighted digital Display: 3 large LED digital display Resolution: 0.1dB below 100dB, 1dB above 100dB Display Mode: Fast and Slow Optional Microphone Type: Diameter. 6mm ECM type Alarm Mode: Built-in alarm buzzer Operating Voltage: USB DC5V 1A Operating Temperature and Humidity: 0~40 degrees Celsius, 10%~80% RH Storage Temperature and Humidity: 0~60 degrees Celsius, 10%~70% RH Power Supply: 5V 1A AC/DC adapter Item Size: 2216632.5mm / 8.702.601.28in Item Weight: 518g / 18.28oz Packing Weight: 701g / 24.74oz Packing Size: 24.59.25.2cm / 9.653.622.05 inches Packing List: 1 * Sound Level Meter 1 * USB Cable 1 * User Manual (English)