An authentication method for establishing a connection between devices that want to communicate data in a communication environment using communication specification such as Bluetooth is provided. The fixing member further includes a control portion, a latch extending up from the control portion, and a resilient arm connecting the control portion and the latch to the main portion. Inserts are provided, which are inserted or can be inserted into the electrification strip and have plug receivers protected against electric shock for device plugs of the devices to be connected, as well as contact elements which are or can be brought into electrical contact with the contact rails. The cap is removable in the first position and the cap is locked to the outer cover in the second position. The first and second laser beam pulses impinge on the surface of the selected structure respective first and second beam spots. The invention concerns the field of timepiece movements.