uxcell LED Digital Wireless Door Bell Multi-Unit Doorbell Reciever Kit with 36 Chimes, 2 AC Receiver 1 Remote Button DC Transmitter, 1000 ft Range, Black RC range up to 1000 ft through accurate test in open area. 36 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. 1 million sets of auto-learning codes to avoid interference between doorbells. ABS flame retardant shell material, green environmental protection.