The Byron Smartwares BY401W Wireless Wall Mounted Chime Kit has a 60m range, and a chime with 4 sounds. It features self-learning codes and will keep the code even when the batteries run out and are replaced.
The battery powered wall mounted chime can be mounted anywhere within the operating range. It has an 80-85dB rating, depending on the sound. Compatible with all Byron B ranges.
The chime requires 3 x AA batteries (NOT included).
The push requires 1 x CR2032 battery (included).