Large LED Display: Decibel meter equipped with 11 inches screen and brightness adjustable, which allow to see the real-time decibel level , Temperature and Humidity clearly. AUTO Alarm s: the noise alarm face will automatically switch when the decibel at different level. Green Less than 60dB;Yellow 60~75dB;Orange 75~85dB;Red More than 85dB High AccuracyDecibel Level Measuring Range: 30~130dB , Accuracy: ±1.5dB; Frequency response range: 50Hz ~8.5KHz; Temperature Range: 14~140°F; Humidity Range: 20~85% User-FridendlyDecibel sound meter powered with 2000mAh Lithium battery, 9.8 feet(300 cm) length USB cable for charging, don't worry the USB cable is not length enough. Wide Applications: This Large LED display Decibel Meter can be mounted on the wall or placed on the table, it's an noise meter to test the sound level in Classroom, Studio room, traffic routes, factories, construction site, home, offices, etc.