laptop AC adapter for 16V 4.5A Input:100-240V Output:16V 4.5A Internal Diameter: 2.5mm External Diameter: 5.5mm laptop AC ... adapter 16V 4.5A :Compatible with :X Series:X20, X21, X22, X23, X24, X30 ... , A22P, A30, A30P, A31, A31PE Series:E530.... laptop AC adapter for 16V 4.5A