8-in-2 Surface Pro 9 10 11 Hub: Microsoft Surface Pro 9 Docking Station turns the 2 USB-C connection into 8 ports: 4K HDMI port, 100M Ethernet LAN, USB 3.0*2, 3.5mm Audio, USB-C(Display+Data+100W PD Charging), SD slot, Micro SD slot. Surface Pro 9 dongle only compatible with Microsoft Surface Pro 11/10/9/X 4K HDMI adapter for Surface Pro 9: Surface pro 9 accessories support 4K@30Hz Ultra HD resolution, through the HDMI interface can be connected to an external display. You can enjoy an ultra-high-definition visual experience by extending you Surface pro 9 to a 4K effect HDTV/monitor/projector. Whether watching movies, office are more comfortable, Microsoft Surface pro 9 hub backward compatible with 1080P/720P/576P/480P/etc Surface Pro 9 Adapter with RJ45 Ethernet: Surface Pro 9 hub offers full 10/100 Mbps over RJ45 Ethernet port, download movies quicker, transfer files faster, reduce latency, Surface Pro 9 docking station ensure the Wi-Fi connection more stable 100W USB-C Power D