Delay / self-timer (delay): just like the self-timer on your camera. With the TM timer remote switch, you can set any delay (in 1 second increments) up to 99 hours, 59 minutes and 59 seconds.
There are several reasons why you might not want to hold your iPhone while taking a picture: You need to snap the perfect still photo while your iPhone is on a tripod and don’t want to spoil the shot ...