Techniques are disclosed to provide advanced power management in generic USB drivers. The lens barrier is urged toward the open position by an urging mechanism, and is kept in the closed position by a locking mechanism. The absorbent assembly can either be biaxially stretchable or segmented with longitudinal stretch. The mobile telephony service provider can be instructed to implement and cancel call forwarding instructions by dialing a special character string on the mobile telephony device. The magnetic bearing component linked with the rotor shaft of the spinning rotor is configured as a slotted permanent magnet ring, thereby ensuring the deformability required for fitting a ring liner.