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:ModelSW-525AMeasurement RangeResolutionAccuracy±1.5dBFrequency Response Range31.5Hz~8.5KHzFrequency WeightingAResponseFastResolution0.1dB(<100dB), 1dB(>100dB)Alarm ReminderYesAlarm OutputYesStorage FunctionNoCommunicationNoPower SupplyDC5V 1A micro USBProduct Size(appr.)23 x 13 x 2.8cm / 9.1 x 5.1 x 1.1inPackage Weight(appr.)588gPackage Included: 1 * Sound Level Meter1 * USB CableInstruction: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..