This is an original Microsoft 12v 2.58a charger, model 1625 and is identical to the picture shown, this model has the magnetic snap in connector to charge your 36w tablet as well as a USB 2.0 port, that you can charge a whole host of different USB accessories you may own and with 12v 2.58a of power this Microsoft 36w power supply can easily charge both devices.
 
Genuine Microsoft 36w power supply charger specification:
 
Power output: 12v 2.58a
Power input 100-240v
Connector type: Magnetic snap in connector
USB 2.0 connection: Yes 1x USB 2.0 port
USB Output: 5v 1a
Total power: 36w
Contents: Microsoft 36w charger & standard mains lead power cable.
Microsoft model: 1625
P/n: Ktc hu10042-14079

• Key points of the Genuine Microsoft 12v 2.58a power supply
• Fits Microsoft Surface Pro 3
• Free Mains power cable cord
• UK supplier with Uk stock
• USB 2.0 also on charging unit
• Original 36w Surface charger

 
A standard mains cable power lead cord is included with your Microsoft Surface Pro 3 power adapter, so you can charge your Surface tablet straight away. If you order from outside the UK we will send your countries correct power cord.

Will also fit some Microsoft surface pro 4 that only require the 12v 2.58a 36 charger.