tDCS devices are small electronic devices that are powered by batteries. There is typically a control panel that allows you to program the gadget in question (to set the intensity and duration of stimulation). A headpiece — commonly an elastic band — is used to keep the electrodes in place once they are placed on the head. Each electrode is connected to the simulator by means of a cable. When the stimulator is turned on, electricity passes from the device to the electrode, and then via the brain to produce the desired effect. Stimulators designed for professional use offer a variety of characteristics that help to guarantee that stimulation is bearable and consistent. This consists of a current meter as well as an impedance meter.