How does the camera set the timer countdown?

How to start the countdown of vivo mobile phone camera: enter the camera (switch to the front camera according to actual needs)-icon in the upper right corner-(countdown)-select the number of seconds (3s/5s/ 10s)- press the shutter to take pictures.

Time-lapse photography how to turn on the camera: enter the camera (you can switch to the front camera according to actual needs)-slide to more-time-lapse photography-click the clock icon-set the required double speed and shooting duration, and then click the red button to start shooting.

Note: Only some models support this function.