This is the single example of the frequently sited Eldith device matched to a photo of the device. I’m not sure if perhaps neuroConn changed the name of the device, or…?
Transcranial direct current stimulation (tDCS)
_ Mechanism of action
Contemporary tDCS protocols typically involve the application of a 1 mA or 2 mA direct current (DC) for up to 20 minutes between two surface electrodes. These may vary in size, but are commonly _35cm2 (5×7 cm). The electrodes are placed on the scalp, one serving as the anode and the other as the cathode. Current flows from the anode to the cathode, some being diverted through the scalp and some moving through the brain.15
Figure 2. Eldith transcranial direct current stimulation (tDCS)
stimulator with electrodes. Photo by the author.
via Transcranial direct current stimulation in the treatment of depression | Medicographia.