Feature:1. 2.7in large LCD display for easy reading, convenient to use. Wide measurement range from 30dB to 130dB, Frequency: 31.5Hz - 8KHz, Resolution: 0.1dB, Accuracy: ±1.5dB.2. With A and C equivalent weighted sound pressure levels. Fast and slow dynamic characteristic mode. AC and DC signal output for frequency analyzer level recorder, FFT analyzer, graphic recorder, etc.3. With maximum/minimum value measurement. 90-130dB alarm level setup range, it will hold the maximum value once the measured level is large than the alarm setup level.4. Low battery indication, automatic and manual power off function. Equipped with sponge ball and a storage pouch. Compact and light, convenient to hold and carry.5. Portable and easy to use, suitable for checking, monitoring or controlling the sound level for personal, families, business, studies, industrial, etc.Specification:Specifications:Material: ABSAccuracy: ±1.5dB (at the calibration point, 94dB@1KHz)Frequency Response: 31.5Hz~8.0kHzDynamic Range: 50dBMeasure Range: 30~130dBA, 35~130dBCFrequency Weighting: A weighted and C weightingDigital Display: 4 digitResolution: 0.1dBSampling Speed: 2 time per secondAnalog Bar Graph: One bar is 1dB, sample rate is two times per secondOverload Alert: OVER or UNDER to show the stageAC Signal Output: 0.707V rms at FS, output impedance approx. 600ohmDC Signal Output: 10mV/dB, output impedance approx. 100ohmTime Weighting: Fast/SlowMicrophone: 1/2 inch ECM type microphoneOperating Temperature and Humidity: 0～40℃, 10%～80%RHStorage Temperature: 10～60℃, 10%～70%RHPower Supply(NOT included): 1 * 9V 6F22 battery or 9V 100mA DC adapterLCD Size: 52 * 43mm / 2.05 * 2.01inItem Size: 221 * 66 * 32.5mm / 8.70 * 2.60 * 1.28inItem Weight: 200g / 7.06ozPackage Weight: 261g / 9.23ozPackage Size: 24.5 * 9.2 * 5.2cm / 9.65 * 3.62 * 2.05in.Package List:1 * Sound Level Meter1 * Storage Pouch1 * User Manual(English)Note:When measuring the noise in outdoors, please put a sponge ball on the microphone head to prevent the microphone from being blown directly to cause airflow noise.