The Genie Bracelet

 The Genies wore a brass bracelet for magical purposes, made of brass that was a form of heat and fire technology not known to humans, a kind of control of certain creatures and for both war and healing and other things. But, what would be cool is a more dumbed down tech version of the same thing. Such as both for communication, syncing with locks of doors like ur house and car. Payments and numbers could be exchanges by a single wave or nearness of the bracelet to another. The arms are also a very kinetic and elemental area that can control a lot of the body's hormonal and ligament type of energy, that is very much liked to the mind and certain dna that is very heat based. So it can be used for things like healing and even music and vibration. 《~~~ good shit right there.