This time delay module provides you a way to control the time. Some time, you may want to control a LED on/off within some time, a microcontroller would be ok for such an application, but it would be troublesome, and expensive! This module would be help in these applications. With this module, you can set a delay time 0~14 minutes with the onboard potentiometer, unlike the other mechanic timer, this module is also friendly to microcontrollers, you can set the module start/stop timing, which makes it convenient in actual projects.