Deluxe Remote Receiver with On/Off Switch The SA 201, with its sleek modern case, will alert you by flashing any lamp plugged into its plug outlet. The plug-outlet allows you to keep your table free of unsightly lamp cords. The signaling lamp can also be used for normal room lighting with the lamp's on/off switch. An indicator light reminds you to turn on the attached lamp. Must be used with a Sonic Alert signaler. Five year warranty. What else do I need to make this work? In order to be notified, you will need to purchase a signaler or transmitter that will activate this receiver.