Features Super large 9.6" LCD digital display with backlight that makes reading more clear and visually in dark areas. 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. Data 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. Connecting computer with USB cable you can down-load records collect samples and print chart and dateetc. 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 hotals laboratory theaters and audio syst etc. Specifications Model SW-525B Accuracy ±1.5dB Measurement Range 30~130dB Frequency Response Range 31.5Hz~8.5KHz Frequency Weighting A Response Fast Resolution 0.1dB(<100dB) 1dB(>100dB) Alarm Reminder(sound+display) Yes Alarm Output Yes Storage Function 2secs/time can be stored for a year Communication connecting PC via USB cable Working Temperature/Humidity 0-40 10%~80%RH Storage Temperature/Humidity -10-60 10%~70%RH Characteristics Material Plastic Metal Color Black Power DC 5V 1A micro USB Product Size(appr.) 210 * 130 * 28mm / 8.3 * 5.1 * 1.1inch Package Weight(appr.) 612g Accessories USB Cable User Manual CD Packing 1 x SW-523sound level meter DC 5v 1A micro USB cable Origin:Mainland China Measurement Range:30~130dB is_customized:Yes Is Smart Device:NO Model Number:SW-523 Certification:CE Measurement range:30 ~ 130dB (dB) Frequency response:31.5Hz ~ 8.5kHz working environment:0 - 40 degrees 10 - 80%RH Storage of Temp. and humidity:-10~60C. 10~70%RH Sampling rate:2times/second Power supply:3pcs AAA battery (not include) SW Sound Level Meter:sonometros digital noise meter:digital sound level meter sound meter:sound level meters decibel meter:digital sound level meters sound level meter:mini digital sound level meters