Dell Alienware 17 R2 (Early 2015) - Manual (Page 20)

Specifications
Views
System
Information
Memory
Ports and
Connectors
Dimensions and
Weight
Computer
Environment
Storage
Touchpad Power Adapter Camera
Communications
Battery
Video Audio
Display Keyboard
Media-Card
Reader
Touchpad
Resolution:
Horizontal
Vertical 1727 dpi
1092 dpi
Dimensions:
Width 100 mm (3.94 in)
Height 56 mm (2.20 in)