Wireless plug-in deluxe chime with up to 150' operation range. 1.5" speaker, adjustable volume control, plays 8 sounds. Different sounds for front and back doors. 32 selectable codes block interference from outside signals. Works with all Carlon chime systems. Includes 2 push-buttons. Replacement 3 volt lithium battery refer to Model No. 30587 (SKU 846260). White.