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 &Blue Material: ABS Plastic Display: LCD Display Dimension:6.97*2.2*1.4*inches Frequency weighting: A Weighting Frequency response: 31.5Hz -8KHz Level ranges: 30dB -130dB Resolution: 0.1dB Response time: (FAST)125ms Accuracy: ± 1.5dB Operation Environment: 0-40 ° C 10-80%RH Storage Environment: -10-60 ° C 0-90%RH Auto power off: Auto shout down after 12 minutes of inactivity Sensor: 1/2 inch electric condenser microphone Power: 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 Meter 1 * Sponge Ball 1 * Package Box 1 * User Manual