DX-40-2 (n + 2) type common non-visual intercom system by straight

DX-40-2-type building intercom system is factory original in 2007, re-introduced to the community in general economic straight by non-visual intercom innovative products. System to take (n + 2) vertical wiring bus, three-wire extension into the family; the spirit of reliable, safe operation, sound design principles of economic, Department of affordable housing in our country, security and reconstruction of old buildings and the old town to get a new machine market demand the introduction of a cheap, cost-effective, highly competitive visitors intercom system. This product is available in the not-for-line, the next line without conditions, replacing the common market (N + 3), (N + 4) multi-line system of the old equipment.