Dell Latitude D531 (Mid 2007) - Manual (Page 145)

Specifications 145
Pixel pitch:
WXGA 0.2588 mm(15.4-inch display)
Power consumption (panel with
backlight) (typical):
WXGA 5.0 W (maximum)
Controls Brightness can be controlled through keyboard shortcuts
and through QuickSet.
Keyboard
Number of keys
87 (U.S. and Canada); 87 (China); 89 (Brazil); 88
(Europe); 91 (Japan)
Key travel 2.7 mm ± 0.3 mm (0.11 inch ± 0.016 inch)
Key spacing 19.05 mm ± 0.3 mm (0.75 inch ± 0.012 inch)
Layout QWERTY/AZERTY/Kanji
Touch Pad
X/Y position resolution
(graphics table mode) 240 cpi
Size:
Width 64.88-mm (2.55-inch) sensor-active area
Height 48.88-mm (1.92-inch) rectangle
Battery
Primary Type 4-cell "smart" lithium ion (32 WHr)
6-cell "smart" lithium ion (56 WHr)
9-cell "smart" lithium ion (85 WHr)
Secondary Type Lithium Polymer (48 WHr) in D-Module
NOTE: Some auto/air adapters may not have sufficient
wattage to charge a 9-cell battery, but they will still power
the computer.
Weight 0.26 kg (0.57 lb) (4 cell)
0.35 kg (0.78 lb) (6 cell)
0.48 kg (1.1 lb) (9 cell)
Voltage 14.8 VDC (4 cell)
11.1 VDC (6 cell)
Display (continued)