Thinkpad X4 Notebook X40 X41 Docking Station - 26R853626R8536 - 26R8343AC Adapter & AC Cord Are IncludedAC Adapter P/N: 02K6810 - 02K6816This is a dock for the X40, X41 and X41 Tablet ThinkPads.Compatibility: ThinkPad X40 Series 2371 2372 2382 2386 2525 2526 2527 2528 All; ThinkPad X41 Tablet Series 1866 1867 AllIntegrated Key Lock: YesUltrabay Support: Modular bay supports Ultrabay Slim options including the DVD-ROM CD-RW/DVD-ROM combination and Multi-Burner Plus drives second Hard Drive Adapter to house an additional hard drive