Decibel Meter Data LoggerDANOPLUS decibel meter is able to record up to 43,000 data, it could view on the main unit PC, and also export data via excel file whlie connecting to PC ThreeColor Light AlarmThe decibel meter sound level reader is equipped with 3color light, alerts you with green, yellow, and red indicators for low, medium, and high noise levels, you may manually set the alarm threshold High Accuracy The noise decibel meter is measuring range from 30130dB and 1.5dB accuracy, colored screen with line chart display with visual noise data changes, analog bars, date and time yearmonthdayhourminutesecond AC Frequency WeightingThe db meter can switch between bB A and C frequency with adjustable FAST SLOW measuring response; and comes with DC output the noise value by voltage mode according to the proportion USB Charging PC ConnectivityDANOPLUS sound meter is compatible with Windows 7, 10, and 11 for connecting, data exporting, analysis, and printing, its about 1.5h charging in 1000mAh capacity