Rod Speed formulated the question :

"Nightjar" wrote in message
...
On 08-Sep-16 6:45 PM, ARW wrote:
I know that it is a 30mm by 4mm glass capusle with some electronics
inside it.

But other than that I have no idea.

http://wiki.diyfaq.org.uk/images/2/2f/Wtf1.jpg

It looks like a pet microchip to me.

Too long for that.

Pet microchips are the size of a grain of rice, but that certainly
looks like some sort of RF ID tag.