Features： 1、High Quality Material: This is a noise meter made of high quality ABS, which can make the service life longer. 2、Backlight Display: The noise meter has an automatic backlight display, which is convenient for viewing in dark conditions. 3、Decibel Display: The noise meter can display, measure the absolute high and low peak decibels (Maximum Minimum) and switch the display. 4、Power Reminder: A noise meter with low power reminder function will automatically shut down to save power when is not used for a long time. 5、Applicable Fields: The noise meter is suitable for the frequency spectrum of many different fields such as music recording, neighbor noise complaints, industrial environment, office environment, speech therapy and so on. Specification： Item Type: Noise Measure Device Model: GM1351 Material: ABS Measuring Range: 30-130 dBA Accuracy: ±1.5 dB Digital Resolution: 4 Digits & 0.1 dB Frequency Response: 31.5Hz ~8KHz Frequency Weighting Characteristics: A (Simulating Human Ears) Sampling Frequency: 2 Times Per Sec Microphone: 1/2in Condenser Microphone Usage Scenarios: Suitable for the Spectrum of Many Different Fields Such as Music Recording, Neighbor Noise Complaints, Industrial Environment, Office Environment, Speech Therapy and so on. Ship without Battery, Use a 9V 6F22 Square Battery Package List： 1 x Noise Meter  1 x User Manual