What type of communication device must be reported to Range Control when checked out?

The correct choice highlights the importance of communication protocols on a range. Cell phones are often regulated due to their potential for distraction or interference during operations. When they are checked out, reporting to Range Control ensures that all personnel are accounted for and can maintain communication without causing disruption to activities on the range.

Additionally, the nature of cellular networks can create vulnerability in communication security, thereby necessitating oversight by Range Control to manage which devices are allowed in the operational area. This ensures a coordinated approach to communication and enhances safety during training and operations.

The other options, while also being forms of communication, may not have the same level of regulations or oversight required. This makes cell phones the primary focus due to their ubiquitous use and the need for careful control in specific environments like a range.