This wireless doorbell is battery operated at both receiver and pushbutton doorbell . The push button doorbell is a snap to install - Simply use the double side tape to align and then use screws to secure the transmitter to the wall or door! The transmitter has one common 12 Volt battery found at many drug stores. The receiver has may be plugged into any 115 - 120 volt outlet. The batteries with normal use of 20 times per day should last about a year. This chime has a range of up to 100 feet ( line of sight ) with a realistically tested 70 feet transmission). The receiver is volume controlled and may use any of 8 pleasant tones:

DING DONG TWICE

SLEIGH RIDE

WESTMINSTER

KNOCK KNOCK

CLASSICAL 1

CLASSICAL 2

CHRISTMAS TONE

FURLISE