uxcell Meccanixity US Plug 52 Tunes Music Songs Security Digital Waterproof Wireless Doorbell Kit Cordless Door Bell Chime 1 Receiver 2 Remote Push Button Transmitter 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.