"NSK" is a Shenzhen based Chinese manufacturing company with R&D and marketing departments. We have been focusing on VIDEO DOORPHONE SYSTEM and VIDEO ENTRY SYSTEMS for last 8 years, and following systems had been launched and marketed successfully:
1.CX system: Four wire, "Start" Connection;
2.NCX system: Four wire, "Distributor Bus" Connection;
3.NTW system: Two wire, Repeater Bus Connection;
4.PBX system: PBX switch and Video distributor Bu connection;
5.DWL system: Digital wireless,2.4G;
6.IP system: IP routing.