Cebek I-27 module is a sequential timer which operated two separate relays. The timer can be activated by supplying power to the unit or there is provision to use a small push button. The timer¹ will switch the first relay after the elapsed time has been reached, the second timer² will also then be activated and it's relay will be switched once that time has expired. The Cebek I-27 module has inputs and outputs to allow other similar modules to be added, to increase the number of sequential switched relays. LED's give visual indication of the relay outputs.