User-operated paddle button with : - a first pallet (16; 156) and a second pallet (18; 158), each able to move parallel to a common trajectory , between a retracted position and a pushed position when the user presses on at least one of these pallets, - a first sensor capable of measuring the position of the first pallet along the common path independently of the position of the second pallet along this common path, - a second sensor capable of measuring the position of the second pallet along the common path independently of the position of the first pallet along this common path, characterised in that : - the first and second pallets (16, 18; 156, 158) are mechanically attached to each other solely by means of a detachable zone (20; 160; 180; 200) to allow only simultaneous movement of the first and second pallets as long as one of the pallets is not locked relative to the other, - this dissociable zone is capable of giving way as soon as the difference between the bearing forces exerted on the first and second pallets, respectively, exceeds a predetermined threshold, this predetermined threshold being adjusted so as to be crossed by the user bearing on one of the pallets while the movement of the other of the pallets is blocked, and - when the dissociable zone has given way, the first pallet (16; 156) and the second pallet (18; 158) are dissociated from each other, i.e. the dissociable zone no longer mechanically connects the first and second pallets together so that the second pallet can be moved, by the user, between its retracted and pushed positions independently of the first pallet parallel to the common path . - a first pallet (16; 156) and a second pallet (18; 158), each able to move parallel to a common trajectory , between a retracted position and a pushed position when the user presses on at least one of these pallets, - a first sensor capable of measuring the position of the first pallet along the common path independently of the position of the second pallet along this common path, - a second sensor capable of measuring the position of the second pallet along the common path independently of the position of the first pallet along this common path, - the first and second pallets (16, 18; 156, 158) are mechanically attached to each other solely by means of a detachable zone (20; 160; 180; 200) to allow only simultaneous movement of the first and second pallets as long as one of the pallets is not locked relative to the other, - this dissociable zone is capable of giving way as soon as the difference between the bearing forces exerted on the first and second pallets, respectively, exceeds a predetermined threshold, this predetermined threshold being adjusted so as to be crossed by the user bearing on one of the pallets while the movement of the other of the pallets is blocked, and - when the dissociable zone has given way, the first pallet (16; 156) and the second pallet (18; 158) are dissociated from each other, i.e. the dissociable zone no longer mechanically connects the first and second pallets together so that the second pallet can be moved, by the user, between its retracted and pushed positions independently of the first pallet parallel to the common path . <EOS>