The byron smartwares by202 wireless plug in door chime kit has a 100m range and a chime with 6 sounds over a million self learning codes will keep the code even when the chime unit is unplugged and then re plugged in can have up to 6 bell pushes controlling the chime 80 85d b rating depending on the sound f version also has a flashing light alert for the hard of hearing the push requires 1 x cr2032 battery included