Macbook Air 13 Inch (2011), Windows OS On Bootcamp Partition in Upper Thomson Road, Northeast Singapore for sale

Well-maintained, still flawless Macbook Air 13 Inch; lightly and used with care over the past 4 years. No faults at all. Selling to upgrade.
Specs At A Glance:
Macbook Air 13 Inch (2011); (1440 x 900)
Software Mac OS X Lion 10.7.5 (11G63)
Total 4GB Memory - OS System (2GB); runs Windows on Bootcamp partition (2GB)
Processor 1.7 GHz Intel Core i5
Memory 4 GB 1333 MHz DDR3
Graphics Intel HD Graphics 3000 384 MB
Runs full suite of Microsoft Office 2011 (Word, Excel, Powerpoint, OneNote, Publisher, Access) on both Mac OS and Windows Bootcamp partition
Startup Disk: Macintosh HD
Hardware Specs (As Copied From System Report):
Model Name: MacBook Air
Model Identifier: MacBookAir4,2
Processor Name: Intel Core i5
Processor Speed: 1.7 GHz
Number of Processors: 1
Total Number of Cores: 2
L2 Cache (per Core): 256 KB
L3 Cache: 3 MB
Memory: 4 GB
Boot ROM Version: MBA41.0077.B0E
SMC Version (system): 1.73f63