Feature 1、Super large 9.6 inch LCD digital display with backlight that makes reading more clear and visually in dark areas 2、Alarm function. When the measuring value is over the alarm value, the meter will make a sound beeping and lock the data with blinking for 2 minutes 3、Application: families, factories, offices, hotels, hospitals, laboratory, theaters and audio systems, etc 4、Wide measuring range: 30‑130dB, fast responding, stable and reliable performance. 5、Wall hanging type. With the hanging hole, it can installed on the wall to or free stand on the table Description: The Sound Level Meter is versatile device for measuring sound strength in an acoustic environment-loud or soft; high pitched, low-pitched; inter-mittent or continuous. This meter can be used in measuring noise of various occasions and appliances such as factory, office, home, traffic route, acoustics, air-conditioner refrigerator, etc. You can test surround sound system to see exactly how much sound each to see if any adjustments need to be done. Features: Super large 9.6 inch LCD digital display with backlight that makes reading more clear and visually in dark areas. Wide measuring range: 30-130dB, fast responding, stable and reliable performance. Real-time monitoring, provides the accurate data of the sound level in your surrounding. Alarm function. When the measuring value is over the alarm value, the meter will make a sound beeping and lock the data with blinking for 2 minutes. Wall hanging type. With the hanging hole, it can installed on the wall to or free stand on the table. Application: families, factories, offices, hotels, hospitals, laboratory, theaters and audio systems, etc. Specification: Model SW-525A Measurement Range Resolution Accuracy ±1.5dB Frequency Response Range 31.5Hz~8.5KHz Frequency Weighting A Response Fast Resolution 0.1dB(<100dB), 1dB(>100dB) Alarm Reminder Yes Alarm Output Yes Storage Function No Communication No Power Supply DC5V 1A micro USB Product Size(appr.) 23 x 13 x 2.8cm / 9.1 x 5.1 x 1.1in Package Weight(appr.) 588g Package Included: 1 * Sound Level Meter 1 * USB Cable Instruction: 1. Power ON/OFF Key: short press for power on, hold for power off. 2. Down Key: short press for reducing value while setting, hold for continuous reducing. 3. Up Key: short press for increasing value while setting, hold for continuous increasing. 4. Alarm ON/OFF Key: short press for ON/OFF alarm, hold for setting.