The equipment is bulky, and the wrist and pendant devices are not very useful as a means of communication if the mobile device is not close at hand, because the mobile device is the only source of communication. That requires the user to carry the mobile device anytime they leave the room in which the device is sitting on the charger in order to be able to articulate any possible problem. For this reason, the wrist and/or pendant are not very useful in requesting direct help. The only reasonable solution is to carry the mobil device at all times. That requires putting the bulky mobile device in a pocket of some kind, which is awkward.