With the customer-approaching strategy, in 1998, we found that many regions still had low voltage grid, about 40V-60V(source 220V). although there 30 brands of voltage regulator at that time in vietnam market, no brand can solve this problem. So consumers either can not use voltage regulator or must use two together, or use one with a survolteur to get enough output voltage. This is not economic and risky. With a patience in researching and a consistence to overcome all difficulties, now robot has succeeded and has beeen the poineer in making 40V input automatic voltage regulator, meeting all customer demand. With that success, ROBOT made a break-through as well as a new progress in of producing voltage regulator, na dnow customers speak highly of ROBOT.