When using an SD card fot storage, the camera will cover the old footage automatically when the storage capacity is full.
If you want to delete the footage on one single day, you can check it in 'Playback', then delete it manually.
If you want to wipe out all the footage in the SD card at once, you go to the settings and format the SD card.
1.Open App, and enter the Live Stream Page.
2.Click the 'ยทยทยท' in the upper right corner.
3.Scroll down to find 'Storage settings'.
4.Click 'Format'.