The Doctor rummages around under the metal grated floor of the Tardis control deck before emerging with the proud smile of a dog finding it's favourite toy. He grins widely and then holds up a chunky box shaped hunk of metal with a screen and some switches on it

This is my Timey Whimey Detector! It goes 'ding' when there's stuff.

He says, climbing back onto the control deck. He grins expectantly at you as if that's extremely impressive