The devices can be charged with a 220 V city power supply and can work with their original battery. When the devices are switched on, they are automatically defibrillated. The devices have a biphasic operating principle. The battery of the devices is of a rechargeable type which does not require maintenance and can defibrillate at least 50 times with maximum energy when fully charged. The devices also have automatic discharge feature. If desired, they are discharged via an external switch. The devices also have a memory card with at least 512 MB of recording capacity, and the amount of energy, number of heart rate, date and time are recorded when recording.