The byron smartwares by103 wireless plug through chime kit has a 60 metre operating distance it provides a choice of four melodies it features self learning codes and will keep the code even when the batteries run out and are replaced its plug through feature means that there is no loss of socket another mains powered object can to be powered by plugging into the chimes socket it has a 80 85d b rating depending on the sound compatible with all byron db ranges the plug in chime is mains powered t