A device including: an actuation unit that is a rotatable ring including a permanent magnet affixed to an inner periphery of the ring, wherein the ring is capable of assuming several predetermined angular positions and the permanent magnet moves with the ring; an integrally closed enclosure on which the actuation unit is mounted enabling adjustment of a parameter or operating mode of the device, wherein the ring surrounds the enclosure; one or more sensors that can be guided by magnetic effect according to an angular position of the ring, each sensor being capable of sending at least one signal corresponding to a modification of the parameter or of the operating mode of the device; and means for processing each signal and for changing the parameter or the operating mode of the device depending on each signal.