1) With high efficiency and true voltage output automatically (without operation by hand) 2)Auto-reset to the lowest voltage (+15v) after current interruption to protect your laptop/ notbook computer. 3)Including 8 connectors for user to change voltage easily 4)Different voltage suitable for the most laptops/notbook computers 5)Active PFC design 6) Patent design connector size as below: 6.3*3.0mm 5.5*2.5mm 6.5*4.4mm(with 1.4mm pin) 4.8*1.7mm 5.5*2.5mm 5.0*3.0mm(with 1.0mm pin ) 5.5*2.1mm 6.5*4.4mm(with 1.4mm pin