Specifications: Color; White Measuring Range: 30130dB, 35130dBC Frequency Weighting Characteristic: A C Accuracy: 1.5 dB Digit Resolution: 5 bits 0.1dB Frequency Response: 31.5Hz 8.5KHz Time Weighting: FAST / SLOW Sampling Rate: 2times/second Microphone: 1/2inch Capacitance Microphone Power Supply: DC 6V 100mA Adapter or 4pcs 1.5V AA Batteries (NOT included) Dimension: 256*70*35mm / 10.08*2.76*1.38in Weight: Approx. 816g Package List: 1x Digital Noise Meter (Batteries is NOT included) 1x Output Line 1x Windproof Ball 1x Manual 1x Box Equipped with sponge ball Equipped with sponge ball to filter out unwanted . wildly application Great tool for monitoring noise levels in hotels, conference halls, home theater, hospitals, and any other noise sensitive environments LCD display It can convert sound into electrical , process data and displays results on LCD. sound quality control design This noise testing equipment is designed for sound quality control that measures sound level from 30dBA 130dBA. easy and convenient to use This digital noise meter Mini handheld noise meter with light weight, easy and convenient to use