Never miss an important visitor again! You can install a doorbell anywhere in your house with the 2-Entry Plug-In 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 can be plugged into any 120-volt outlet. Ideal for use in your workshop, laundry room, garage or patio, the 2-Entry Plug-In 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 need to hear the doorbell in a location that doesn't have a convenient outlet, a 2-Entry Battery-Operated 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 Plug-In 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.