Decibel Meter Data Logger 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 PCThree-Color Light AlarmThe decibel meter sound level reader is equipped with 3-color light, alerts you with green, yellow, and red indicators for low, medium, and high noise levels, you may manually set the alarm thresholdHigh Accuracy The noise decibel meter is measuring range from 30~130dB and +/-1.5dB accuracy, colored screen with line chart display with visual noise data changes, analog bars, date and time ( (year-month-day-hour-minute-second)A/C 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 proportionUSB Charging & PC Connectivity sound meter is compatible with Windows 7, 10, and 11 for connecting, data exporting, analysis, and printing, it's about 1.5h charging in 1000mAh capacity