What does this bit do?

[Bosco15]

Under the lhs of tail, R3R.

Anyone have any idea what it does?
Tip sensor? Or something similar.

 

[Bosco15]

I

Under the lhs of tail, R3R.

Anyone have any idea what it does?
Tip sensor? Or something similar.

I found it.
Immobiliser receiver. Must be where you tap your key under tail.