Finish:Marble Wireless Battery Operated Door Chime And Weatherproof Outdoor Chime Extender Outdoor chime extender activates when existing chime sounds. Simply place the extender on top of existing chime to extend the transmission range to up to 400 feet. Weatherproof for outdoor use. Optional chime selections include an 8-note Westminster melody or a 2-note melody. Includes a battery operated chime with adjustable volume control and one chime extender.