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 85d b 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