Computers and their external equipments; equipments used in communication and navigation; instruments and meters for measuring and electric measuring; apparatus and instruments for scientific research in laboratories; transistors and carbons used in electrical equipments; components of electron and electricity; electrical controlling apparatus and equipments; batteries, chargers; a portable device for modifying the electro-magnetic field, or only the magnetic field or only the electric field to achieve the desired result based on a patient's reaction to electromagnetic (EM) field (such as a heartbeat frequency or rhythm change); a heartbeat rate sensing system including an accelerometer for sensing a movement of a body part caused by blood flow or heartbeat vibrations; an EM wave generator using a relatively low frequency pulsed magnetic field to stimulate blood circulation in a patient's body; a portable device providing the EM wave with the desired spatial treatment pattern and intensity within a patient's body while minimizing power consumption by the portable device and maintaining sufficient beneficial treatment effect; an electronic therapeutic device and system using customized emitted EM waves varying dynamically with time for excitation; software automatically configuring and selecting wave shapes and waveform characteristics of EM pulses applying to a patient during treatment; a cell or tissue excitation terminal including a power monitoring device; a portable device including a processor, a human body status detection device or sensor, one or more EM wave generators, and a power device; a portable device including a human body status detection device, a communication device for communication between the portable device and a remote medical system, and one or more bioelectromagnetic wave generators