[Iris is wearing hers, which she built in the shape of a rather attractive metal hairclip, and she turns her head now to show Racetrack.]

No, they're little. Very limited. About all they can do is contact each other; I 'ad to make 'em as inmateproof as I could, 'cause the idea were that everyone could 'ave one. Most of 'em I made to look like little animals or jewellery.