How does this charge the laptop? I don't see a power cord.

It uses any existing charger for your laptop that connects via USB-C. The female USB-C port on this adapter is where you would connect your existing usb-c power.

Questions & Answers: StarTech.com CDP2HDUCP USB-C to HDMI Adapter - 4K 60Hz - Thunderbolt 3 Compatible - with Power Delivery (USB PD) - USB C Adapter Converter

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StarTech.com CDP2HDUCP USB-C to HDMI Adapter - 4K 60Hz - Thunderbolt 3 Compatible - with Power Delivery (USB PD) - USB C Adapter Converter

Increase port availability with this USB-C video adapter which charges your laptop and connects HDMI to the same port
USB Type C to HDMI adapter supports UHD resolutions up to 4K 60Hz
Black USB C to HDMI adapter exactly matches the cables for your Ultrabook or laptop
Connect your BYOD laptop to an HDMI display at work or school using this USB C to HDMI converter
Thunderbolt 3 compatible USB C display adapter

$53^.99 –