... , much wider vision Visitor calling, video intercom, unlock, monitor. 1.B/W 4 inch CRT2.Metal outdoor station3.pin hole camera, much ... function7.weatherproof and vandal proof out door station8.built-in power adapter available9.Three years' quality warranty(all out door stations ... can be changeable)10 able to display TV.11 power-saving, moving melody.Brightness, chroma and ring adjustable