does this have its own power supply?

The USB-C port on the hub only supports charging currently, and the hub doesn’t need to power up. For charging laptops or other extended devices, you need to plug the original charger of your devices into the type-c port on the hub.

Questions & Answers: USB C Hub Multiport Adapter, 10 in 1 Laptop Docking Station Dual Monitors Dongle Dock with 4K HDMI, VGA, Ethernet, 3 USB 3.0, PD 3.0, SD/TF, Mic/Audio for MacBook Pro/Air, Dell, Surface Go, HP

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USB C Hub Multiport Adapter, 10 in 1 Laptop Docking Station Dual Monitors Dongle Dock with 4K HDMI, VGA, Ethernet, 3 USB 3.0, PD 3.0, SD/TF, Mic/Audio for MacBook Pro/Air, Dell, Surface Go, HP

This usb c hub multiport adapter for Mac or other USB-C devices with the multiport USB-C hub featuring an Ethernet port, a USB C charging port with power delivery, a 4K/30Hz HDMI port, a SD card reader, a TF card reader, a 3.5mm Audio/mic 2-in-1 jack and a VGA port, 3 USB 3.0 Ports, allowing you to connect a keyboard, USB driver, external Disk or Wired headset to your USB-C devices. This usb c multiport hub applies to all laptops with type-c port.
10 in 1 USB C Hub
1 x 4K@30Hz HDMI Video Adapter
1 x 1080P VGA Port
3 x USB3.0 High Speed Port
1 x RJ45 1000M Ethernet port
2 x SD/TF Card Reader
1 x 87W Power Delivery
1 x 3.5mm Audio/mic Port

$34^.49 –