Later, we started to have the technology to use. we also known as The projector which Is used instead of a blackboard. To help the teaching is fast. Because teachers can prepare images or text to describe from their home. If any text has passed, you can come back to see them again without rewriting. Transparency projector can use in a regular classroom. No need for a dark room like a slide or movie. And a teacher facing the participants. Make it easy to control the class.