With modern compact and portable appearance design.Accuracy up to ±1.5dB.Maximum value holding function to lock up the maximum reading.Large LCD screen with digits reading.Equipped with a sponge ball.Auto power off design for energy saving.Auto backlight display.Portable, easy-to-use and handy instrument for sound quality control in factory, traffic, family, and audio system.Measuring range: 30-130dBAAccuracy: ±1.5dBFrequency range: 31.5Hz to 8.5KHzFrequency weighting: ADigital display: 4digitsResolution: 0.1dBSample rate: 2 times/secondMicrophone: 1/2 inch electret condenser microphoneMax hold: MAXPower supply: 9V battery (the battery is not included)Power life: About 30 hours (alkaline battery)Operating condition: 0-40℃ 10-80%RHStorage condition: -10--+60℃ 10-70%RHProduct weight: 105gPackage weight: 130gProduct size: 14.2 * 5.3 * 3.5cmPackage size: 15.2 * 6.0 * 4.2cmPackage list:1 * Sound Level Meter1 * Sponge Ball1 * User Manual