A linear actuator system comprising: at least one electric linear actuator, an electric motor for driving the linear actuator, a controller for controlling the operation of the electrical motor, at least one user control unit, at least one electrical cord comprising at least one plug for connecting the user control unit and the controller, where the controller or the user control unit comprises a socket for receiving the plug, characterized in that the linear actuator system comprises a locking ring rotatably arranged relative to the plug, the socket comprises an opening for receiving the plug including the locking ring, and where the socket comprises an aperture through which a part of the locking ring is accessible when the plug including the locking ring is engaged with the socket, where the locking ring comprises at least one protrusion (8a, 8b) and the opening of the socket comprises at least one recess, where the at least one recess comprises an axial part (12a, 12b) and a radial part (12c, 12d), and where the locking ring and the opening of the socket are adapted such that the locking ring when inserted in the opening can be rotated between a first position, i.e. an unlocked position, and a second position, i.e. a locked position: where, in the first position, the unlocked position, the at least one protrusion (8a,8b) is received in and aligned with the axial part (12a, 12b) of the recess, such that the plug may freely be inserted into or removed from the socket, and where, in the second position, the locked position, the at least one protrusion (8a,8b) engages the radial part (12c,12d) of the recess, such that the plug is prevented from being unplugged. at least one electric linear actuator, an electric motor for driving the linear actuator, a controller for controlling the operation of the electrical motor, at least one user control unit, at least one electrical cord comprising at least one plug for connecting the user control unit and the controller, where the controller or the user control unit comprises a socket for receiving the plug, characterized in that the linear actuator system comprises a locking ring rotatably arranged relative to the plug, the socket comprises an opening for receiving the plug including the locking ring, and where the socket comprises an aperture through which a part of the locking ring is accessible when the plug including the locking ring is engaged with the socket, where the locking ring comprises at least one protrusion (8a, 8b) and the opening of the socket comprises at least one recess, where the at least one recess comprises an axial part (12a, 12b) and a radial part (12c, 12d), and where the locking ring and the opening of the socket are adapted such that the locking ring when inserted in the opening can be rotated between a first position, i.e. an unlocked position, and a second position, i.e. a locked position: where, in the first position, the unlocked position, the at least one protrusion (8a,8b) is received in and aligned with the axial part (12a, 12b) of the recess, such that the plug may freely be inserted into or removed from the socket, and where, in the second position, the locked position, the at least one protrusion (8a,8b) engages the radial part (12c,12d) of the recess, such that the plug is prevented from being unplugged. where, in the first position, the unlocked position, the at least one protrusion (8a,8b) is received in and aligned with the axial part (12a, 12b) of the recess, such that the plug may freely be inserted into or removed from the socket, and where, in the second position, the locked position, the at least one protrusion (8a,8b) engages the radial part (12c,12d) of the recess, such that the plug is prevented from being unplugged.