A:Answer Hello Allison,
The j5create - VGA to HDMI Video adapter (JDA214) is designed to connect to a VGA output and USB port on a computer, allowing you to connect an HDMI input device, such as a monitor, television, or projector.
If you are needing to connect a Roku device, with an HDMI output, to a VGA display, I must recommend a different device. I recommend that you consider the j5create - HDMI-to-VGA adapter (JDA213).