This product is mainly used to test the noise generated normally. It can accurately measure the decibel value of noise, small size, simple operation, light weight and portable belt. Sound db meter calibrated at factory, noise measurement range from 0 - 130dBA, accuracy: ±1.5dB, resolution: 0.1dB. Disable the automatic off function, sound meter can continuously measure noise value. Sound meter features backlight alarm, large LCD display, maximum/ minimum noise monitor, data hold function, auto/manual power off, disable the auto off function, sound level meter can continuously measure noise value, battery indication. Decibel meter is perfect for music recording, home theater setup, neighbors noise complaints, job-site and noise pollution monitoring. Portable sound level meter is light and compact design, easy to carry with you and operate with one-hand. The digital sound noise level meter is equipped with sponge ball to wind, compact and , easy to carry and operate. Measuring range:30dBA-130dBA Accuracy:±1.5 dB Frequency range:31.5Hz-8.5KHz Frequency weighting:A Resolution:0.1dB Microphone:1/2 inch electric condenser microphone Power supply:3 x 1.5V AAA Batteries( Battery not included) Working Temperature and Humidity:0-40℃(32-104℉), 10-80%RH Colour:Orange & Black Material:ABS Package Contents: 1 * Sound Level Meter Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.