Wireless door chime, put it on shops, supermarket, office, home to welcome guests. Send out"hello welcome" automaticlly Wireless door chime1, Put it ... automaticly when somebody pass through it; 3, When the switch is put on"music", there are ten music to be ... chosen; 4, When the switch is put on"voice", it will sends out"hello, welcome ... 7. Unit size: 10.5*6.1*4.1cm Door chime