The Byron BY236E consists of a doorbell button and 2 wireless receivers. All of the separate elements of this doorbell are wirelessly connected to each other. Place the doorbell button next to the front door and plug 1 receiver into a socket. The other receiver is portable, so you can take it anywhere in the house or garden. Bear in mind that it has a maximum range of 125 meters. The receivers have 8 different melodies, so you're sure to find a suitable melody.