Star Trek The Original Series Light Up Communicator that crew uses.
Lights up and make sounds.
Great for Cosplay or Halloween costume.
See video if you have any questions.

Communicator Size:
Closed it is 3.5" long by 2" wide.
Opened it is 6".
This is not as large as the official stage prop. It is slightly smaller.

Battery Size:
3x LR41 (requires small screwdriver to replace)
Because these are "New Old Stock", the batteries may or may not work. They can be replaced but old batteries do lose charge over time.

Photos of this item taken by Deals-Wild.