The present invention, the first printed circuit portion (4) that is on the watch case bracelet or strap (8) including a first arm 58 and second arm 60 to be received therein, said first arm 58 is a second connected to the watch case (8) is extended by a median part (6) arranged so as to be located below in addition, the median part (6) has a first printed circuit portion 4 by means of an electrical connection means It includes a printed circuit portion 10, and the first printed circuit portion (4) is provided with at least one electrical energy source (38) and a microcontroller (30) for power supply and controls the pressure sensor 32 the median part 6 is Watch case 8 is covered by an insert (16) arranged to serve as a seating portion for the housing 50, the pressure sensor 32 is arranged inside the insert (16) It is provided in the ambient pressure sensor (32) The communication with the outside to be disposed in contact with the body, and the pressure sensor 32 includes a housing 50 and a second printed circuit portion of the second printed circuit portion 10 by inserting a sealing gasket (54) between (10) It is mounted on.