The present invention provides a fluoroalkyl-group-containing compound that has high water solubility and is highly capable of reducing the surface tension of an aqueous composition. The acoustic leakage analyzer is to analyze signals from the touch sensing ear piece region and on that basis adjust an audio processing parameter. The DC power source can remain coupled to the appliance during operation and during recharging without necessitating removal for remote recharging by the use of a unique switch. In another embodiment a distal-most end of the activation extension can be closer to a longitudinal axis extending through the flange than the inner surface of the sealing wall. The method also includes selectively retrieving the information regarding the recorded parameter from the resulting processed data file. Feedback control provides a means for precise, wideband control of optical frequency and phase, augmented further by four wave mixing stages and digitally stitched independent optical waveforms for enhanced tunability.