A piezoactuator includes a base. The controller receives signals through the antenna. A group conversation user wishing to hold the side bar conversation uses his user interface to alert other group conversation user with whom he would like to hold the side bar conversation. A safety shield is hingedly mounted to the hub and can be rotated from an open position spaced from the needle cannula so that the distal end of the needle cannula can be used to deliver a drug to a patient. The housing may be disposed on one of the ends of the outer shaft and may include a recess. The top surface of the first ferromagnetic layer is in contact with the first non-magnetic layer.