Dell Inspiron 15R SE (7520, Mid 2010) - Manual (Page 8)

Touchpad
Inspiron
14R-5420/7420/
M421R-5425 Inspiron
15R-5520/7520/
M521R-5525
X/Y position resolution
(graphics table mode) 240 cpi 240 cpi
Size
Height 52.7 mm (2.07 inches)
sensor-active area 52.7 mm (2.07 inches)
sensor-active area
Width 97.0 mm (3.82 inches)
rectangle 97.0 mm (3.82 inches)
rectangle
Keyboard (backlit)
Inspiron
14R-5420/7420/
M421R-5425 Inspiron
15R-5520/7520/
M521R-5525
Number of keys 102 (U.S.)
103 (United Kingdom)
106 (Japan)
105 (Brazil) 102 (U.S.)
103 (United Kingdom)
106 (Japan)
105 (Brazil)