Akuvox Palm-Size 2MP Video Intercom Door Phone (R20A-2)2 wire video intercom systems remain demanded as long as there are so many houses left with old wiring in the walls, which is indeed problematic to replace. Akuvox came up with a solution to address the issue to allow you to get the benefits of IP network type system, but with old wiring and with no replacements done. Vandal resistant body, with a flush button Two pin wire for power supply and network access Wide angle camera: 110 (H), 58 (V) IC ID