Zoom does not list any specific hardware recommendations; the software can be downloaded and installed on practically all desktops, laptops, and mobile devices like smartphones and tablets. Meeting invitations also include a phone number so that those participants with slow or no internet connection can call into the meeting, although they will be limited to audio participation.
Zoom does a good job of automatically adjusting to the quality of a participants’ internet connection, but some participants may still not have a connection that is strong or reliable enough to join synchronously. If you want your students to check their current internet speed, have them navigate to the SpeedTest website. Anything less than 1 Mbps likely won’t be a good experience.