Never miss an important visitor again! You can install a doorbell anywhere in your house with the 2-Entry Battery-Operated Wireless Chime. Mount these battery-powered doorbells at your front and back doors, and when a visitor presses one, it transmits wirelessly up to 100 feet to the receiver, which is powered by two AA batteries (sold separately). Ideal for use in your workshop, laundry room, garage or patio, the 2-Entry Battery-Operated Wireless Chime allows you to hear the doorbell chime ring out in any room in your home. This dual-transmitter system is even smart enough to let you know which door your visitor is behind: The front-door transmitter triggers a "Westminster" sound, while the back-door transmitter initiates a standard two-tone "ding-dong" chime. Additional Wireless Chime Options Available If you perfer to plug the chime module into a convenient outlet, a 2-Entry Plug-In Wireless Chime is also available. If you'll only need to set up a doorbell at one entry, you can set up the single-transmitter Battery-Operated Wireless Chime. An Additional Wireless Chime Transmitter is also available: Pick up as many as you need for doorbells at each entrance to your home.