Decibel Meter Sound Level Reader + Humidity & Temperature. Classroom Noise5731\n\nFeatures: AUTO Alarm Icons: the noise alarm face\nautomatically switch when the decibel at different level. [Green ]Less than 60dB;[Yellow ]60~75dB;[Orange ]75~85dB;[Red ]More than 85dB\nHigh Accuracy:Decibel Level Measuring Range: 30~130dB , Accuracy: \u00B11.5dB; Frequency response range: 50Hz ~8.5KHz; Temperature Range: 14~140\u00B0F; Humidity Range: 20~85%\nEXTRA LARGE LCD DISPLAY & WALL MOUNT: Our digital sound level meter is equipped with a high-definition backlit LCD screen, so that you can effortlessly read it throughout the day at your convenience. Unlike handheld sound level meters, our premium wall-mountable dB meter is simple to set up and perfect for continuous monitoring.\nVERSATILE & LONG-LASTING: Our classroom noise meter can be used all over your space. It's wall mountable with a 10ft power cord, flat-bottomed for placing on tables, and lasts for hours unplugged with a 2000Ml