uxcell Meccanixity 300M Range 52 Songs Waterproof Plug-in Digital Portable Wireless Door Bell Kit Cordless Doorbell Chimes 2 Receivers 1 Remote Push Button,Gray RC range up to 1000 ft through accurate test in open area. 52 chimes included: pick one you like from modern to old fashioned chimes. Multi-levels of volume loud enough and low enough so it will not disturb any sleeping children. Using learning code to prevent interference from other wireless transmitters. ABS flame retardant shell material, green environmental protection.