The Dahua Ultra series 4-wire hybrid Android indoor monitor is designed for buildings that use, or are moving toward, a mix of traditional four-wire cabling and modern network-based intercom. The hybrid approach lets one monitor fit into existing wiring while keeping the door open to IP technology, so developers can upgrade in stages instead of rewiring an entire building. At the top of the Android indoor monitor range, the Ultra series offers live video, two-way voice and remote door release through an Android-based touchscreen that residents find easy to use. It is well suited to premium apartment blocks, refurbishment projects and mixed-technology communities.