The ThinkPad Ultraportable 56W AC Adapter supports the ThinkPad Port Replicator, the ThinkPad Multiple Battery Charger, and various ThinkPad systems including the ThinkPad X Series and S Series. You can benefit from greater convenience by keeping spare Ultraportable Adapters at home, at work, and attached to your Port Replicator. This new adapter is lightweight and convenient to carry.