??13-inches LED Screen?DANOPLUS 13 INCHES LED Screen sound meter displays Decibel Level(30-130dB), Time(AM/PM), Temperature(degree C/degree F) Humidity(0-100%RH) and brightness adjustable ??Buzzer Alarm?The decibel meter sound level reader is equipped with buzzer alarm function with adjustable decibel THRESOLD, and you may open or DISABLE the buzzer alarm according to your need ??Face Icons Indicator?The decibel meters is automatically switch the face icons according to the different decibel level,?Green Face?Less than 60dB;?Yellow Face?60~85dB;?Red Face?More than 85dB ??High Accuracy?The db meter has large measuring Range: 30-130dB with high accuracy: +/-1dB, all of the readings of decibel level, Temperature and Humidity is fully calibrated from the factory which ensure high accuracy and long-term usage ??User-Fridendly?The sound meter comes with large capacity lithium battery(last for 10hours in fully charged), suggest to keep charging if keep it working all the time; 9.8 feet(300 cm) charging cord, no worry the cable is not length enough