This depends on the type of micro spy you use. Some micro-spy units can record audio data on an internal memory card or on an external device via wireless connection. You can then access the recordings using a computer or other compatible device. Other micro-espions can only be used for live listening and do not offer the ability to store recordings. It is important to carefully read the specifications of the product before buying it to find out if it offers the storage functionality of the records. It is also important to respect local privacy and surveillance laws.