This optional software allows the CEL-246 real-time USB output to be logged and stored on a PC. Sound pressure levels are stored by dB24 every second into a data file compatible with PC based spreadsheet applications. Data stored within the CEL-246 can also be accessed since these meters act like a memory stick, allowing the transfer of data to spreadsheet applications. The Casella dB24 Software allows for regular data logging for noise investigation purposes, time history trending and a hard copy of results for archive purposes. Other applications of the software include analysis of short duration significant events such as pile driving or aircraft flyovers, the removal of unwanted samples when it is not required to gather information and also for the investigation of neighborhood noise nuisance complaints. The software can still record when unattended noise monitoring is being carried out at inconvenient times of the day. An advantage of the software is that it can provide input to official reports.