The Powerlink 2 Control Unit is designed to be used with a wide variety of electrical devices (up to 1700 watts). First you plug the control unit into a grounded wall outlet. Then connect the electrical devices (you may connect two devices which will go on/off at the same time) and a switch into the unit. When the switch is activated, the device is turned on. You may choose from the following modes of control: direct mode, timed seconds mode, timed minutes mode and latch mode. Whether you’re in a self- contained classroom or fully- included site, the PowerLink 2 control unit offers simple ways to give students control of almost any electrical apliance during a variety of activities.