Nowadays, more and more portable devices are powered by battery. A smaller, higher power and lower temperature charger becomes more and more important especially our working style and leisure activities are changing. GaN is a new technology that can fulfill our new living habits to provide high enough power to all our digital devices such as mobile phone, tablet, notebook computer, headphone by using a single adaptor. Meanwhile, carbon neutrality is another key topic. Efficiency becomes a hard figure in the coming. STMicroelectronics GaN technology is one of key device to achieve high efficiency and less material used.