An integrated circuit for use with an external Hall sensor that permits to at least substantially cancel out the temperature drifts of the Hall sensor, as caused by the temperature drift of the current supplied to the Hall sensor, and the gain of the Sigma-Delta modulator. The charging system includes a power supply output device provided with the information terminal and a first battery control device provided with the portable equipment. The composite material includes a porous expanded fluoropolymer membrane and an elastomer, wherein the elastomer fills substantially all of the pores of the porous expanded fluoropolymer, and the composite material comprising less than about 80% fluoropolymer by weight. In this way, the lock can remain locked but with the alarm disarmed. A orphan handler identifies objects that may be potential orphan objects based on factors.