?Decibel Data Logger?The Decibel Meter itself can record up to 1999 groups of data, and can record unlimited storage while connecting to PC via software, software is compatible with Windows 7, 8, 10, and 11 (with 64 bits OS) ?Alarm Function?The buzzer and indicator of the sound meter will alarm when the decibel level exceeds the setting threshold limit, you may manually adjust the upper and lower threshold ?High Preicision?DANOPLUS sound level meter is equipped with large LCD colored screen with analog bar scale, +/-1.5dB accuracy with 30~130dB measuring range and 1/2 inch microphone ?A/C/Z Frequency Weighting?The noise Meter offers A, C, and Z frequency weighting and FAST/SLOW options, Fahrenheit and Celsius display, Calibration setting, MAX/MIN/AVG/HOLD Function ?Dual Power Source?Decibel Meter use a 3 x 1.5V AAA battery or USB micro interface 5V (both included in the set), with auto power off (APO) and disable function