Power Box 702925 DPC-7500-COMBO-4P Lighting Controller A unique feature of this model is that you can also set the last two outlets to be times with the main group or to provide constant power Built-in digital timer with battery backup The 120 volt outlets can be times with the 240 volt outlets or set to constant power Detachable trigger cord can override the built-in timer , so it can be controlled by other devices