Line In (blue), Line Out (lime), and Microphone (pink) jacks.

2x USB 2.0 ports and PS/2 Keyboard/Mouse ports. Expansion: PCI and PCIe slots for adapters. Key Layout Information

Access the ThinkCentre User Guide via the Lenovo Guides & Manuals page. typically features the following hardware specifications: Form Factor: Micro-ATX (standard for A55/M55e series).