A connector includes a connector protrusion to be inserted into a connector socket and including a locking lever provided on a first surface and a connecting terminal provided on a second surface opposing the first surface or on a front surface; and a connector frame surrounding the connector protrusion and having an opening in a surface opposing the first surface of the connector protrusion. The battery charging circuit sets termination current, however, according to the capacity of the battery under charge, regardless of the properties of the charging source. The separating elements are part of a set that is provided with at least two separating elements Ti encompassing different stationary phases Si. At the same time a scratch protection layer may be formed over regions not overlying optical sensors. The invention also provides pharmaceutically acceptable compositions comprising the compounds of the invention and methods of using the compositions in the treatment of various disorders.