A pressing device includes a circuit board, a shaft lower cover, a shaft upper cover, and a movable shaft body. The circuit board includes first and second surfaces, a through hole penetrating the surfaces, and an induction coil surrounding the hole. The shaft lower cover includes a lower cover base disposed on the first surface. The shaft upper cover on the lower base includes an opening. The movable shaft body is movably disposed between the shaft upper and lower covers, and includes a movable base partially protruding from an opening and a columnar shaft is connected to an induction member. When the movable shaft body is pressed down, the columnar shaft extends into the hollow shaft base, and the induction member passes through the through hole, causing the induction coil to produce changes of induced current.

A wireless communication capsule sensor with an electronic magnetic switch includes a battery, a microprocessor and an actuation module. The battery is electrically connected to the microprocessor through an electronic magnetic switch and an energy storage element. The actuation module is electrically connected to the microprocessor. The energy storage element stores energy using a small current outputted by the battery. When the microprocessor is in sleep mode and the electronic magnetic switch receives an external magnetic field, the electronic magnetic switch outputs a trigger signal to wake up the microprocessor, so the microprocessor uses the electrical energy of the storage element and battery to drive the actuation module for bio-signal detection or physical therapy. When the microprocessor is in working mode and the electronic magnetic switch receives the magnetic field again, the electronic magnetic switch outputs a trigger signal, and the microprocessor stops the operation of the actuation module.