1.Portable and convenient. 2.Over-current protection,short-circuit protection etc. 3.Controlled by computer chip technology. Equipped with 8 kinds of different specifications of the DC conversion connector : PLUGSIZEADAPTABLEM16.0*3.0TOSHIBA M25.5*2.5IBM,LENOVO M36.5*4.4 FUJITSU,SONYM44.8*1.7CAMPQ,HPM55.5*2.5Acer, Compaq, Delta, HP, Fujitsu, Gateway, Toshiba, LiteonM65.0*3.0SamsungM75.5*2.1Acer, ...