Measuring range is 30~130dB, when the measuring value is over the alarm value, the meter will make a sound beeping and lock the data with blinking for 2 minutesThe device can measure internal or external noise. There are hanging holes in the back, which can be hung on the wall to save space.Large digital LCD display that provides clear readings. Delivers ultra accurate reading with no guessing errors with high resolutionFeatures instant, easy to read, legibly written results indicating a specific valueCan be used in measuring noise of various occasions and appliances such as factory, office, home, traffic route, acoustics, air-condition, refrigerator, etc.Condition: Model: SW-525AMeasuring Range: 30-130dB(dB)Accuracy: 1.5 dB (In standard sound 94db @ 1khz)Frequency Response: 31.5Hz- 8.5khzFrequency Weighting: AResponse Time: FastMicrophone: 6 Mm Condenser MicrophonePower: DC 5V 1A Micro-USBOperating Environment: 0-40 10-80% RHStorage Temperature and Humidity: -10~60 10~70% RHSize: Approx. 210 x 130 x 28mm / 8.3 x 5.1 x 1.1inMaterial:ABS+electronic componentscolour:BlackPackage Contents:1 x Sound Level Meter1 x English manual1 x USB CableOnly the above package content, other products are not included.Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.