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The left-hand sides of the three notebooks all carry a pair of audio jacks (mic/headphone) and a USB port; the Classmate and Eee add an RJ-45 Ethernet connector and a fan intake — features missing from the wireless-only, passive-cooled OLPC XO. The latter's ear-like antennas cater for 802.11s mesh networking as well as standard 802.11b/g Wi-Fi connectivity (also supported in the Classmate and Eee).
The connector for the XO's 12V AC adapter is also on the left-hand side: the notebook is designed to work with off-grid power sources such as solar panels and car batteries; a human-powered 'yo-yo' pull-cord generator has also been designed, although this is not yet widely available.
Another unusual feature of the XO is its microphone input, which can also be used to measure voltage and resistance, allowing sensors to be plugged in and their output recorded by the included Measure application (or 'activity' in OLPC's terminology).
The ASUS Eee is the only notebook of this trio with a VGA connector for an external monitor. The right-hand side of the Eee also carries two USB 2.0 ports (making a total of three), an SD/MMC card slot and a Kensington lock slot. The Intel Classmate's right side has the power connector, a second USB port and a fan vent, while the OLPC XO has a pair of USB ports (again making three in all), one mounted horizontally, the other vertically.
Viewed from the front, the bulkiness of the 4.4cm-thick Intel Classmate (centre) is clear, as is the relative slimness of the ASUS Eee, which tapers from 3.5cm at the back to 2.15cm at the front