The Lenovo ThinkPad 170 W AC adapter provides instant power to your W520/W530 laptop. It's designed for the older, round-barrel tip and performs to the specifications of the standard AC charger that is supplied with ThinkPad W520 and W530 laptops. Use it as a replacement or as a convenient spare to ensure you're never without power. Lenovo safeguards each adapter with a one-year warranty, offering renowned support and service.