One of the supporter device for Online Class is Screenleap. You can share your screen instantly to any device with a browser. The sharing process is quick and easy, just click "Share your screen now!" and it will be shared to your students. But, the free account only can get 40 minutes for the Online Class for 8 students only. If you have a large number of students, you have to upgrage it. Here is the subscription price:
And this is the Screenleap's website