Check that you and your students are using one of the below recommended browsers. If they're not, change to a supported browser (97% of users are already on the correct browser).
You can run a speed test by googling "Test Speed".
The example below shows an example that's close to the minimum internet specs. During your lesson, ensure that you or anyone else on the network are not downloading anything.
Now you’ll be asked to Allow WinClass to access to your camera and microphone here. Select “Always allow” and reload your page. Once reloaded, you might need to re-enter our online classroom and all should work.
NB: If you have multiple cameras and microphones here you can select which microphone and camera to use.