This door chime uses self learning technology, with 1 million running codes to help prevent operating interference. with 32 selectable melodies: Within 24 polyphonic and 8 monophonic sounds to choose from.<br/>Batteries: BEll push uses 1 x CR2032 3V Lithium battery (included). YHe main chime unit uses 3 x 1.5V AA batteries (not included).
Morrisons Grocery