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 minutesData storage: The instrument will automatically store the data every 2 seconds, and the stored value is the largest noise value in 2s, which can last for one year Application: families, factories, offices, hotels, hospitals, laboratory, theaters and audio systems, etc Specification: Model: SW-525BAccuracy:±1.5dBMeasurement Range: 30~130dBFrequency Response Range:31.5Hz~8.5KHzFrequency Weighting: AResponse: FastResolution: 0.1dB(<100dB), 1dB(>100dB)Alarm Reminder(sound+display): Yes Alarm Output:YesStorage Function: 2secs/time, can be stored for a yearCommunication: connecting PC via USB cableWorking Temperature/Humidity: 0-40℃, 10%~80%Storage Temperature/Humidity: -10-60℃, 10%~70% Material: Plastic, MetalColor: BlackPower: DC 5V 1A micro USBProduct Size(appr.): 228x125.5x32mm / 9.0x4.9x1.3inchPackage Weight(appr.):612gAccessories: USB Cable, User Manual, CD​ Warning: 1. Do not use meter in high temperature and high humidity environment.2. Do not use meter near corrosive material.3. Do not use meter in the conditions that should be splashed by water.4. Do not use meter in heavy dust environment.5. Do not use meter in an environment with chemical gas.​ Package Included: 1 x Sound Level Meter 1 x USB Cable 1 x User Manual