here are the technical specifications for the Fisher Wallace device:

15.0
DEVICE
SPECIFICATIONS PARAMETER
NOMINAL
VALUE

Output
Amplitude
(milliamperes) 0‐4
mA

Rate 15/500/15.000
Hz
Pulse
Width 33
microseconds
Maximum
Charge
per
Pulse 0.13
microcoulombs
On
Time
per
Burst 50
milliseconds
Off
Time
per
Burst 16.7
milliseconds

so it is a AC current device that pulses??, not DC device.... tDCS is very low mA DC current...

any other comments?