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[[image:UltraBaseX4.gif|UltraBase X4]]
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== X4 UltraBase ==
The X4 UltraBase is a portable dock for the X40 and X41 ThinkPads providing extra ports as well as a bay for an optical drive and a set of stereo speakers. Containing a full featured [[Ultrabay|Ultrabay Slim]] slot, it provides flexibility in drive choice as well as the option of a secondary battery for extended working time on the road. The X4 UltraBase doesn't provide a second docking port as the original [[UltraBase]] did, hence you can't dock the UltraBase to any of the other docking solutions.

=== Features ===
* Passthrough ports:
** Ethernet (RJ45)
** Modem (RJ11)
** USB (three ports)
** [[VGA Port|VGA]]
** [[Serial Port|Serial (DB9-M)]]
** [[Parallel Port|Parallel (DB25-F)]]
** [[PS/2 Port|Combined PS/2 Mouse + Keyboard]]
* Ultrabay Slim
* Stereo speakers
* Kensington security hole
* Fru Number: '''92P3429'''
* Price: around 187 Euros


===Pros & Cons===
* Positives: Expansion capability, portable
* Negatives: makes the ThinkPad quite thick, no extra docking port, not compatible with the [[:Category:X41 Tablet|X41 Tablet]]
* Compatibility: {{X40}}, {{X41}}
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==Ultrabay Slim==
The Ultrabay Slim slot in this dock is a full featured one and supports hot swapping with all Ultrabay Slim drives. You can also feed it with the Ultrabay Slim battery pack to extend the overall battery life time.