You can buy one on Amazon or The Hill, the name is iClicker, this is the link for one:
as the other responses mentioned, you won't need one for remote learning. When things to back to face-to-face instruction you will need to get one. Don't be scared by the price, sometimes used ones are advertised here. I might have mine somewhere and won't be using it anymore.
Iclicker2 Student Remote and Reef 6m Packaging https://www.amazon.com/dp/1319149588/ref=cm_sw_r_cp_api_i_8gnsCb711KTE3