Wireless chime systems use radio frequencies (RF) to transmit a signal from the push button to activate the chime. To prevent interference with your neighbors wireless chime, Heath/Zenith wireless chimes come with 128 different security codes. This code technology makes sure your door chime only works when your push button is activated. Heath/Zenith wireless push buttons could have a range of up to 150 ft Wireless chimes allow you to easily add to, or replace your current chime, even if it is wired. Several Heath/Zenith push buttons utilize patented LED lights to illuminate the button giving you the look of a traditional wired push button. All Heath Zenith wireless chimes and push buttons are compatible.