Timers and Photocells tend not to be accurate and are difficult to set for exactly the same time when you have multiple zones at a single residence. For example, if you have a system with multiple transformers and times then it is almost impossible to set each timer to the exact same time as the other timers. If one is just a little bit off then lights will come on and go off at different times. To solve this, ClaroLux's 12V landscape lighting sequencer is the best option for switching devices on/off for the multi transformer job: place a timer or a photocell on the first transformer and the Sequencer keeps the rest in the same flow. All transformers connected to the Sequencer turn on/off at the same time without the need of expensive timers, remote control modules or other electronic sequencing devices. The installation process of this device is as simple as 1, 2, 3.