SHENZHEN DUOAO TECHNOLOGY CO.,LTD ,belongs to a wholly-owned subsidiaries of OPTFOCUS INTERNATIONAL CO., LIMITED, is established for the better development of the mainland business. We have concentrated on the R&D of Smart Card Management System about 12 years and own our core technology and our brand. 
         DUOAO focus on production and sales of high-tech products of IC card elevators, elevator IC card, elevator access control, IC card access control, parking, smart channel, smart attendance/charging/patrol and other smart card such as ID card, CPU card, fingerprint and so on. 

  Today, more and more DUOAO products apply in Smart Parking Management System, Smart Channel Management System, Smart Attendance/Charging/Patrol Management System and etc in the ARM core, CAN bus areas.

  DUOAO---Manufacture, integrator, elevator companies---your most valued business partner.
       DUOAO---Create value and provide sincere service for property companies, real estate agency and private house and so on.
         DUOAO---Persist in being a middleman (an elevator company, ELV contractor, builders) as the main channel to promote our products. Because it could help the end-user get the most efficient localization services.

 DUOAO---We believe that DUOAO Smart Card System can bring the good things to life and become your preferred brand.