Perfect for replacing your broken or outdated hardwired bell, and for adding pleasant sounding melodies to other areas in you house.Features include:Up to 150-foot operating range.Different sounds for front and back doors (add buttons for extra doors).32 selectable codes block interference from outside signals.Compatible with all Carlon wireless chime systems only. (Note: Not compatible with Carlon wireless doorbell systems.)Six sound optionsFits neatly against wallsMeasures 5.25 x 6.75 x 8 inchesChime requires four C-cell batteries (not included)Door chime button requires two 3-Volt batteries (installed)Retail packaging included