The Nano Fly measures approximately 3cm long and 2.5cm tall.
The container is magnetic and a log sheet is included.
A note from the manufacturer:
Please note in your cache description that the bug is not to be used to unscrew the lid of the container and the “finder” needs to grip the container lid itself to unscrew it to get to the log. Rough handling could cause the bug to come unattached from the container. If your bug does become detached, we recommend replacing with a dot or two of superglue or waterproof epoxy.