Carboxylic acid salts of tertiary amines for use as an accelerator for an anhydride based epoxy curing agents are disclosed. The circuit board has a through hole, and the heat generating component is corresponsive to the through hole and installed on the circuit board, and the heat dissipating element has a protruding embedding portion formed on the other side of the circuit board and embedded into the through hole. In addition, the results of a search using a template of first biometric type are used to limit the search applied using a template of a second biometric type to improve the effectiveness of a one to many search for matching data in a biometric database. At the boundaries of the domain, the pattern adaptive prediction can be coupled with the domain adaptive prediction technique. The portable electronic device further includes a circuit configured to receive a selection corresponding to a selected one of the plurality of hearing aid profiles and to provide the selected one to the hearing aid in response to receiving the selection.