The Byron Smartwares BY112 Portable Wireless Plug-In Door 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.
It also contains a battery powered portable chime that can be taken with you anywhere within the operating range. This portable door chime can have up to 2 bell pushes controlling it. It has an 80-85dB rating, depending on the chime selected. Compatible with all Byron B ranges.
The plug-in chime is mains powered.Portable chime requires 3 x AA batteries (NOT included).Push requires 1 x CR2032 battery (included).