Keep a spare ThinkPad 230 W AC adapter at hand to ensure your device has a consistent flow of power. Keep one adapter in the office, one at home and another in your carrying case for immediate, convenient access to power. This ThinkPad AC adapter is perfect for use as a spare or replacement adapter for compatible laptops. It is compatible with all laptops with the rectangular "slim-tip" common power plug. It is not compatible with legacy notebook systems with the round, barrel-type power plug. ThinkPad AC adapters are compact, so you can easily keep a spare, tucked into your carry case at all times. This 230 W adapter will perform to the exact same standard as the one, which originally came with your laptop. It is highly energy-efficient.