uxcell Portable Wireless Doorbell Kit with 36 Chimes Songs, AC Receiver DC Transmitter, 1000 ft Range, Black RC range up to 1000 ft through accurate test in open area. ABS flame retardant shell material, green environmental protection. 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.