Yep! It's from Doctor Who, and it implants a tiny recording device into the cartiliage of your hand. It was used in the fight against the Silence in the latest series.
I clicked on it because it was priced at something like £3.50 and I thought it'd be a cool piece of merchandise to keep around for the future. Everyone has the sonic screwdriver but how many people have, say, the Judoon scanner?
However, it turns out the company selling it want something like £4.00 for postage and snazzy as it is (it records sounds and lights up) I'm not sure I want to spend that much money on what basically amounts to a toy gun that doesn't actually fire anything.