The current version of the skEYEvue X3 Core DVR does not require SD cards. Alternatively, the X3 Core uses an internal SSD hard drive. However the next iteration of the X3 will include a SD card slot for triggered event recording in the event of a catastrophic accident. For instance, if the SSD hard drive fails due to a bad car accident, the SD card slot will have backup footage from the trigger event. This new SD card feature should be released in late 2021 / early 2022.