A performance display device comprising a base receptacle and a display unit; wherein the display unit comprises a display screen and a processor, and is operable by a mode switch; the mode switch is operated by relative pivotal motion between the display unit and the base receptacle; characterized in that the display unit and the base receptacle are complementarily shaped to cooperatively form a hinge axis about which the mode changing pivotal motion takes place. A performance display device having a hinge axis formed by the complementarily shaped display unit and base receptacle provides a simple, robust, and reliable device.
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