UID is a very limited supply from Secret Factory. Only 55 sets ever made, once they are gone, no more restock.
UID allows you to perform 'which-hand-type' effects in a super clean way.
UID has 2 modes; Magnet detecting and Movement detecting.
In Magnet detecting, you let your spectator hide a coin in one of their hands, and you guess which one it is in with 100% accuracy.
In Movement detecting, you can place UID into many other things, for example in a card case! And you can know whether and when the card case is being moved or lifted from any table or surface. You can even put UID in napkin, make a napkin ball, then use it to perform which-hand effect or sync effect. Think of all the effects you can do with Movement detecting (Which hand, Three things game, Sync raising hand, etc.)! You can create a lot of mentalism routines.
UID comes with detector, receiver, arm band, charging cable, strong magnet half dollar.