The LPTDM1U is a plug-in Slave to receive the Command from the Controller or Routing Slave and through Controller or Routing Slave controls the ON/OFF status of the plug-in lighting fixtures, of which power loading cannot exceed 400W.LPTSM1U Plug Through Switch Module This device is a switch plug-in used between a standard 3 pin 13 amp wall outlet and lamps. Setup and managed by any Z-Wave controller, local operation is possible by pressing the button on the device.