Wireless, plug-in door chime features easy installation and zone-specific chimes for 2 entry ways. Includes chime box that plugs into any standard outlet and 1 matching wireless push button. (1) CR2032 lithium coin cell battery is required to operate the push button, battery included. 2 melody choices: 2-note chime and 1-note chime. Self-programming feature avoids interference with neighboring systems. 3.25 inches wide x 4.25 inches high x 2 inches deep. Weighs 0.5 pounds. 2 year warranty.