The WR-3000 is the receiver for All 3000 Series systems. The WR-3000 plugs into a standard wall outlet and can be placed on a table or mounted on the wall. When the receiver gets a signal from the transmitter, one of four different tones (Classical, Westminster Chime, Ding Dong, or Whistle) will sound for a few seconds. There is also a volume control, allowing you to set the sound to the desired level.The WR-3000 is equipped with four form "C" relays (one for each zone), and one 12-volt DC output terminal that will activate for several seconds when a signal is received. The receiver can be user-programmed, so the 12-volt DC terminal and one relay will activate for 10 minutes, if this is desired. The tones will still sound for several seconds.