Pretty cool.
My chargers got one built in.
So do mine, but I thought it was pretty interesting.
Many smart chargers that have a "desulfanator" feature really just
charge at an unusually high voltage for a period to "cook" the battery
a bit. Not the same as pulsing, and not nearly as effective.
I wonder if either method has the potential to destroy electrical or
electronic devices attached to the battery.
I had a camper that had the high voltage type and it boiled the water
out of the batteries quickly. I didn't have the problems that you might
expect like burned out lamps. Progressive Dynamics was the brand.