Product Notes:1.No preset camera memory, before recording to insert SD / MMC. 2.The camera recording mode for recording the cycle, when the storage medium is full, the camera will go back to the beginning of the storage medium to re-start recording the contents of the file and overwrite the old, (one-time in order to avoid the deletion of old documents in record time to preserve the documents for about two minutes for a section, when) SD / MMC memory card is full and the re-recording, the old document will be overwritten. 3.When the lithium battery is low, the camera will be issued sound, shut down automatically after 30 seconds.