I do realize how important it is to get feedback from students during the class. The more feedback I get the more I can modify instruction so that they can be successful learners. However, my institution does not have an electronic personal response systems.
Here are some ways I or others fake a personal response system:
Have students vote using their hands. I have my vote A, B, C, D starting with their index finger for A They hold their hands in front of their chest so that no one else can see their answer.
Give students a 3 x5 card, have them fold it horizontal and then write a big A on the left side and B on the right; they turn over the card and write C and D. They hold up their response to their chest.
Have students write on small white boards and hold their answer up to you. The whiteboards work well for short answers or drawings. By the way, often “dollar store” type of stores often carry whiteboards. You can also have students draw on their own paper.
Have students point such as when a Spanish teacher says “la puerta”, the students point to the door.
Have students do an action. When a science teacher says “endothermic”, students can pretend to be cold.
Use whatever form of personal response system you want to learn where your students are in their learning journey and make appropriate changes to help them successful navigate their journey.
If you are interested in implementing formative assessment in the classroom, my book, Formative Assessment: Responding to Students is available through Eye-on-Education.