This dummy camera looks light a real one by flashing a red LED. Ideal to hide a clue, e.g. with UV paint, UV marker or reflex paint.
The camera is operated with 2 AA batteries (not included).
Cache hiding suggestions: You can unscrew the backside of the dummy camera. Inside is still a lot of empty space as there is just some electronics to have a flashing LED. You can also hide a log in the battery compartment which is hiden underneath the top cover. Of course you will not have a flashing LED anymore if you use that one. You could also hide a logsheet on the back of the top cover (e.g. in a grip bag).