AuYou Wireless Doorbell Kit Fixed Code with 2 Receiver Plugin and 1 Remote Transmitter Operating over 300ft Range,No Batteries Required for Receiver FASHION DESIGN: doorbell push buttons to feel good; smooth curve surface fit your house's or apartment's decor; easy to install(mount or stick on wall); two chimes ring up at the same time when pushing the button MULTI-CHOICE RINGING: 36 different stereophonic music choices; 3 different adjustable volume levels (low/medium/high;85db) to fit varieties of conditions SAFE: the push button is rated IP44 waterproof for outdoor use; CE/FCC/ROHS certified; ABS material anti-burn and impact resistance APPLICATIONS: GUEST VISTING; CARETAKING (easy for a patient to call their caretaker while the caretaker doing cooking or cleaning in the room); DELIVERY( it audibly rings when delivery courier comes and you're away from the front door) PACKAGE: receivers x 2; button x 1; button battery x 1; screws x 4; anchors x 4; double-side sticker x 1; User Manual x 1