Cebek I-12 is a cyclic timer module which has a relay output. The timer can be activated by supplying power to the unit or there is provision to use a small push button switch. Once the timer has been started it will switch off, after the time¹ you have set it will then switch back on after the time² has timed out. It will keep doing this until the power supply is switched off. The I-12 module has to PCB mounted potentiometers to adjust the on and off times. An LED gives visual indication of the relay.