Sensor doorbell
Used at home, office or shop to welcome guests;
It sends out music automaticly when somebody pass through it;
When the switch is put on"music", there are ten music to be chosen;
When the switch is put on"voice", it will sends out"hello, welcome";
Power supply: 3*AAA or adaptor(not included);
Unit size: 10.5*6.1*4.1cm