Wearable electronic device includes a neck loop worn on a neck with two electromechanical units; two in-ear earphones; two earphone cords. Each unit has an earphone cord winding mechanism including (i) a spool for winding the earphone cord; (ii) a double drive mechanism including an electric motor, a reducer, and a spiral spring; (iii) an engagement mechanism for engagement between the drive mechanism and the spool; and (iv) a lock mechanism. One unit has a motor control key for the electric motor and the lock mechanism. One end of the cords is connected to one of the earphones and the other end to one of the spools. The units are mechanically connected to each other to prevent twisting, and to the neck loop so that one of the units is on the left side of the chest, and the other electromechanical unit is on the right side of the chest.