Abstract: The present invention relates to a portable electronic device comprising: —a housing; —a rotary unit, which can be rotated relative to the housing, and —detection means for detecting a rotational position of the rotary unit. Said detection means comprises: —a magnetic transmitter (10) attached to the rotary unit, for supplying a magnetic field, —a magnetic receiver (11) attached to the housing, which receiver comprises a magnetic field sensor (103) and a magnetic flux guiding arrangement for increasing the magnetic field through the magnetic field sensor.

Abstract: A seat heating device for automotive vehicles including a sheet containing a network of electrically conducting lead wires and connected to the lining cap covering the sheet, wherein said electric network is divided into heating boxes while leaving between two adjacent boxes an intermediate zone extending throughout the width of the sheet and devoid of conductor lead wires, any two adjacent boxes being electrically connected by lead wires extending out of the sheet and forming separate loops, the sheet being adapted to be sewn to the lining cap along a seam within the intermediate zone and said loops being high enough to be outside of the sewing zone when they are spread out in the plane of the sheet.