Serial: DB9 (9-Pin) connection (1), USB: fully-powered USB 2 Type A (2), USB: fully-powered USB 3 Type A (1), USB: fully-powered USB 2 Type C (1, front), USB: fully-powered USB 3 Type C (2), Ethernet: RJ45 Ethernet (2), HDMI (1), input voltage: 15.6V dc