1)Different voltages
2)Different tips
3)Universal AC/DC adapters
4)Good quality
5)Competitive prices

Specifications:

Automatic Adjustable output voltage
With AC and DC input Cable.
With 8 interchangeable tips Suit for most brand laptops
 1. Input Votage: AC100V – 240 V
 2.Output voltage: DC9.5/10.5/12/19/20

3.Output Power:40W MAX
4.Approvals:CE and ROHS
5.  Overload protection     yes
6. Short Circuit Protection  yes  
7.Over voltage protection
8.  Connector Size(mm):A:6.3*3.0 B:6.0*1.4 C:5.5*2.5
                                   D:5.5*2.1 E:5.5*1.5 F:5.0*1.4
                                   G:4.8*1.7 H:4.0*1.7