A display device has electrophoretic particles, a display element including electrodes, between which a portion of the electrophoretic particles is present, a temperature sensor and a processor for supplying a driving pulse to the electrodes to bring the display element to a predetermined black, gray or white state, corresponding to the image information to be displayed. A machine tool has a spindle and a housing disposed around the spindle. The payment module validates the transaction request to verify that the mobile device is authorized to initiate payment for the transaction by a remote server via the long-range communication capability. A speech recognition process or system may be modified based on the sound related vehicle information. A first swirl generator is provided between the first and second sections to receive primary working gas and generating a swirl in the same. The optical network comprises a plurality of nodes having logic to receive and transmit optical signals over a plurality of network interconnections.