Ejoyous Sound Level Meter is applicable for the measurement requirements of sound engineering, quality control, health prevention and various sound measurement such as factories, workshops, schools, residential, offices, road, audio or other construction site, widely applied to work and life.Specification:Color: White &BlueMaterial: ABS PlasticDisplay: LCD DisplayDimension:6.97*2.2*1.4*inchesFrequency weighting: A WeightingFrequency response: 31.5Hz -8KHzLevel ranges: 30dB -130dBResolution: 0.1dBResponse time: (FAST)125msAccuracy: 1.5dB Operation Environment: 0-40C 10-80%RHStorage Environment: -10-60C 0-90%RHAuto power off: Auto shout down after 12 minutes of inactivitySensor: 1/2 inch electric condenser microphonePower: 3* 1.5V AAA Batteries(Not Included)Warm Tips:1. Please do not use the meter under a high temperature and humid environment.2. Please take out the batteries when not in use for a long time to avoid electrolyte leakage and damaging the meter.3. When measuring the noise outside, please mount the wind-resistant ball on the head of the microphone from being directly blown by wind and measuring other noise.Quality Guarantee: Free exchange within 12 months product warranty. If you have any problems, please feel free to contact us. Package Contents:1 * Ejoyous Sound Decibel Meter1 * Sponge Ball1 * Package Box1 * User Manual