A wireless document camera is a useful tool for teachers to display physical documents, books, or 3D objects in a classroom setting. Some popular options are:

1. IPEVO V4K Ultra High Definition 8MP USB Document Camera

2. Elmo MO-1W Wireless Document Camera

3. HUE HD Pro USB Document Camera

These cameras are easy to set up and allow teachers to display documents and objects from a distance to the whole class.