Yesok R&D department include many experienced engineers who had engaged in the field of power supply for years, it has two parts: Taiwan Branch，undertake the job of design; China shenzhen,the headquater take responsible for the commission, samples-making, trail production.

To ensure the design we made with scientificalness, safety and accuracy, the testing equipments we choose are specilized and advanced ones like Japan YAKOGAWA Power Meter, USA Agilent Hybrid Recorder, Taiwan Prodigit Electronics Load, USA Tektronix Oscilloscope,...

Each design is based on our comprehensive investigation and analysis, researcher's strict components-choice and continous commission and tests. All those can guarantee our products have features of practical, safe, economical and long life-span, thus can maximumly meet customer's requirements.