... our own R&D team ,consist one indoor monitor and one ourdoor camera .with its fashionable style ,high ... image transmission3)Full-duplex hands-free call ,clear audio and video4)Visiting key wake up call ,standly power-sawing ... sleep5)Unclock door and alarm function6)CE, ROHS,FCC available7)83 effective ... check out the high tech video door phone ,rock and roll set up