What are some of the features that overhead projectors do not have?

Overhead projectors lack digital connectivity features, such as USB ports or HDMI inputs, limiting their ability to connect directly to modern devices like laptops or tablets. They also do not support multimedia capabilities, such as playing audio or video files, which are common in more advanced projectors. Additionally, overhead projectors do not offer high-definition image quality or advanced image manipulation effects, such as zooming or focusing, found in digital projectors. Lastly, they do not typically have built-in storage or memory functions for saving presentations.