PHYSEN Europe Style Piano Waterproof Wireless Doorbell kit with 2 Push Buttons and 1 Plugin Receiver,1000ft Range,4 Volume Levels and 52 Melodies Chimes,No Battery Required for Receiver Wireless doorbell with high-end cross appearance---Home use doorbell,simultaneously also can decorate your home and like a cross to bless your family safe Signal Alert:Take care of your family.for the elderly,this doorbell can allow immobile or bedridden patients to conveniently to contact their loved ones when they need help.They can hold on hand or put on the wall for theirs convenience Remote Distance:1000 ft in open area.Generally, it can work within 200~700 ft through the metal security door and wall.Wireless range may varies depending on construction and materials.please do not mount the push button on metal materials Waterproof and Weatherproof:Remote transmitter button is rated IP55 waterproof,-30~70 working temperature,no matter it rain or snowing Easy Installation:Just put the double-side stickers at the back of the button, also you can use screw to fix it and plug the receiver into an electrical outlet.CE,FCC,RoHS certified