... , Monitor 2 Visitor calling, Video intercom 3 wide vision,3-year warranty. 4 waterproof 5 China's top bran 4'' Flat CRT ... door phone intercom system with handset1.B/W 4 inch CRT with handset2 Metal outdoor station,weatherproof and vandal proof3 pin ... vison.4.Four wire connection5 Visitor calling, video intercom, unlock, monitor.6 With warning function7 with power adapter8.Three years' quality ...