The Lenovo USB C to HDMI Adapter allows ThinkPad X1 Tablet users (and similarly equipped systems) to easily connect to an HDMI display and charge the system at the same time. Connect to HDMI display at various resolutions up to and including 4K2K @ 30 Hz. It is able to charge the system when connected to HDMI display. Your HDMI display does not require external power. Sleek, durable design that compliments ThinkPad systems.