ThinkPad X4 UltraBase

IBM UltraBase X4 The IBM UltraBase X4 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 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 UltraBase X4 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 Ethernet Modem USB (three ports) VGA Serial (9 pin) Parallel (25 pin) PS2 Keyboard/Mouse (shared port) Ultrabay Slim Stereo speakers Kensington security hole Pros & Cons Positives: Expansion capability, portable Negatives: makes the ThinkPad quite thick, no extra docking port Compatibility: X40, X41 Warranty: Three Years

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.