This Byron B304 Wirefree Port & Plug-through Door Chime kit has a 50 metre operating distance. It provides a choice of two melodies & has volume control. It features self learning codes-will keep the code even when the batteries run out & are replaced. This portable door chime can have up to 2 bell pushes controlling the chime. It has a 80-85dB rating, depending on the sound. Compatible with all Byron B ranges.
Requires 2 x AA batteries (not included).