The Heath/Zenith SL-6140 Wireless Battery-Operated Door Chime Kit includes a battery operated receiver and one battery operated push button (push button battery included) with up to 100-Feet transmission range. The chime has adjustable volume control with a 2-note melody for the front entrance. With 128 possible RF codes combinations, you can expand your system and prevent outside interference. The kit is weather resistant for outside use and can be mounted with either double sided tape or screws. Two "C" Batteries
are required for the chime but batteries are included for the push button.
Add an Additional Plug-In Wireless Chime
so you can hear the doorbell in a remote part of your home.