Nothing is more frustrating than a friend or neighbor paying you a visit only to be neglected at the front step. This wired doorbell intercom system that lets you hear a person calling at your door before you open it. This auction is for a brand new wired intercom system that is ideal for house, office, shops, hotel, tire building and factory, etc. When visitors press the remote button, will give wonderful music. Just try this wired doorbell. There is difference.