Cable Matters Self Powered (No Battery Needed) Wireless Doorbell Kit in Black SELF-POWERED DOORBELL transmitter requires no batteries; Kinetic energy from pressing the doorbell transmitter button powers the signal to ring the doorbell inside; Designed for interference free operation with a paired transmitter and doorbell OUTDOOR RATED WIRELESS DOORBELL transmitter has an IP44 water resistance rating for use in warm or cold climate zones; Use the label holder with a protective cover to identify your office suite or apartment number TASTEFUL DESIGN of doorbell kit with a contemporary look of the transmitter and a turquoise LED on the doorbell receiver; Ideal for adding an additional doorbell with a unique sound; 300 foot operating range covers the footprint of most homes, apartments or small offices CUSTOMIZED CHIMES OR MELODIES includes 25 melody or chime choices, and 3 adjustable volume levels; Low-profile LED on doorbell receiver provides a visible indicator in a noisy environment or for the hard-of-hearing USER FRIENDLY INSTALLATION of outside push button transmitter with the included mounting adhesive strip; Doorbell receiver plugs into an available AC outlet; Install in an RV, mobile home, garage, workshop, warehouse delivery dock, detached apartment unit or use as a wireless door alert for an elderly parent