The Storage of Voice Recorder includes built-in flash memory and external memory cards. The most common capacity of flash memory is 8GB which can meet the daily needs of recording and also be used to store some other files. The quality of the recording is depends on the bit rate of recording, the unit is Kbps, take 8GB for example, the recording time of 128Kbps is 145hr,192Kbps/96hr ,512Kbps/36hr, 768Kbps/24hr, 1024Kbps/18hr, 1536Kbps/12hr. You can choose the product according to demands.