DoorBellWireless Portable 1 Receiver and 1 Button No Batteries Required for the Receiver Waterproof Button Operating at over 900-feet Range with 36 Chimes(Blue) Solid Bulit Quality: Each 1byone door chime kit is equipped with ABS environmental protection materials,long life garuanteed. Lead-free,Non-toxic IP44 Rated Push Button: waterproof , withstand rain, wind and other elements Easy installation; convenient; double-side stickers;long lifetime; easy to DIY; Super power-saving mode,dustproof Intelligent digital remote control doorbell, ideal for homes, offices, guest rooms, hotels, hospitals etc Work up to 900 feet maximumbest (condition without any obstacles)