With the release of firmware version 2.0, a Loop Recording mode has been added to the Prism Tube. Here is how to switch between Normal Recording Mode and Loop Recording Mode. Loop Recording Mode constantly records videos and will replace old video files when SD card is full.
1. While the camera is turned on, press the SD Card Format Button for 1 second to switch between normal recording mode and loop recording mode.
Note: The Blue LED blinks once during normal recording and twice during loop recording.
You can refer to the FAQ on how to update the firmware on the Prism Tube to version 2.0 https://support.sena.com/hc/en-us/articles/115000052546.