Make your world a better and safer place to live Product Information The Safety Street Wireless Door Chime is easy to use with no in-wall wiring hassles. It provides up to 100 ft. remote range. You simply plug the receiver unit into any 120V electrical outlet, install the enclosed 12V battery in the handheld remote unit, and mount the push button control unit at any entrance area. Product Features Convenient to use in various home or working environments Provides you with up to 100 ft. remote range No more hassles with in-wall wiring, just simple plug-in installation A Built-in safety feature with 20,000 available security codes