1、Sound level meter is light in weight, small in size, compact in structure, easy to carry. 2、Decibel meter is ergonomically designed, comfortable to hold and convenient to measure. 3、With photosensor, it will automatically turn on the backlight when the ambient light is insufficient, and automatically turn it off when it is brighter. 4、Condenser microphone probe is sensitive and quick to sample, reducing wind noise interference when measuring outdoors. 5、Easy to use, you only need to install the battery and insert the microphone into the calibrator to perform measurement. Item Type: Decibel Meter Material: ABS Weight: Approx. 680g / 24oz Product Size: Approx. 19.5x7x3cm / 7.7x2.8x1.2in Power Supply: 6F22 9V Battery (battery not included) Measuring Range: 30-130dB Measurement Accuracy: ±1.5dB Resolution: 0.1dB Frequency Response: 31.5Hz-8.5KHz Frequency Weighting: A&C Frequency Weighting Time Weighting: FAST SLOW Sampling Rate: 2 Times/Sec Microphone: 1/2 Inch Condenser Microphone 1 x Decibel Meter (Battery Not Included) 1 x Sponge Ball 1 x 3.5MM Line 1 x Storage Box 1 x Manual