R & D team in H.K. office R & D team in Shen Zhen factory PSL's Research and Development (R & D) department plays an important role in the group's overall success. PSL places a great emphasis on designing and developing unique and innovative products for the overseas markets. PSL stands for Practical with Style in Life. This definition has given a clear direction to its long term product development. All of the original designs created each year are patented worldwide. By increasing the capacity to meet the explosion of its business, PSL operates its engineering department not only in H.K. but also in its China factory with fully computerized equipments. This expansion can keep its overhead at the lowest level which can strengthen the price competitiveness in developing its new products continuously.