Abstract: A modular headset comprises a first unit that has first and second operational modes. In the first operational mode, the unit has a stand-alone functionality and serves as a wireless earpiece of a mobile phone. To this end, the first unit has Bluetooth processing means onboard. In the second mode, the first unit is connected to a second unit, the latter being an earpiece for the other ear. The second unit has processing power onboard for generating stereo audio when coupled with an MP3 player. Resources of the second unit are shared with the first unit in the second operational mode.

Abstract: A piezoelectric actuator, which has a large displacement rate and a relatively simple structure, is capable of providing an output without the need for a specific support and can be manufactured at low costs, is provided. The piezoelectric actuator 10 takes a planar plate-like form and has first and second layer regions 11 and 12 lying one upon the other. The first layer region 11 is formed comprising a piezoelectric ceramic material and contains electrodes 13-1 to 13-n for receiving an actuation voltage to cause this first layer region to contract in a plane parallel thereto. The second layer region 12 is formed integrally with the first layer region 11 and comprises a ceramic material.