This mode is a combination of Timelapse and Lightning modes. You can take lightning photos while timelapse is in progress without disturbing your time-lapse sequence. This mode has 3 parameters:
Sensitivity: This value determines the sensitivity level of your device for lightning. The higher the value you set, the more sensitive it will be. You can move the threshold bar around the button by touching the grey bar.
Interval: This parameter defines the duration between each frame for timelapse. The Interval can have a value from 13 milliseconds up to 100 hours.
Frame: This parameter defines how many pictures are to be taken for timelapse. You can set the frame number up to 99999. If you set the frame number to 0, this will mean that the time-lapse will continue until you stop it.