Emaks&reg; New 48-Watt AC Adapter for Microsoft Surface Pro 3 Docking Station . Model 1627 12V 4A Laptop Notebook Power Transformer with AC Power Cord AC charger for 48W 12V 4A For Microsoft Surface Pro 3 Docking Station (Old Version)Model 1627 Quickly charger, Over Heat protection, well packaged , Notice : This Is A adapter for surface Docking Station , please compare the connector size and Adapter voltage 12V before add to cart ; ship from USA , free replacment for any case. Input: 100-240V ~ 1.3A 50/60Hz (for worldwide use) Output: 12V - 4A Power: 48W Connector size: 4.5*3.0mm Package including : 1 x ac adapter, 1 x us power cord