Wireless Downy Bird Doorbell Item:RD-368 Classification:Wireless Doorbell;Digital Door Chime;Remote Doorbell;Wireless Musical Doorbell;Door Chime Specifications & Features: (1)Remote Distance:30-50 meters (in open area); (2)Chime: Bird Singing Chime + 16 Musical Chime for option; (3)Battery Operated: use 1 "AAA" battery for Transmitter; use 3 "AAA" batteries for Receiver. (4)Downy Bird Design,look very beautiful and vivid; (5)Digital code of frequency can help avoid interferences between similar products. Package: Carton Size:78.5*47.5*51cm QTY/CTN:100pcs G.W.:15kgs 20":112CTN,11,200pcs