Demons can smell like sulfur, roses, cologne...anything! They can also appear as: an angel of light, a dead person or child, a spirit guide, a healing spirit (reiki), an alien, a fairy, a dwarf, a spirit animal etc! We can't safely discern them! The safest thing to do, is let Jesus and his angels protect us.
The recommendation is therefore that the stimulation should be applied with a 2500Hz carrier medium frequency sinusoidal alternating current, burst at 50 Hz (10ms ON: 10ms OFF) at a maximum tolerable level.
Waveforms that have a Phase or Burst Duration. IFC, Biphasic, Russian (note: Russian has a phase duration but it refers to the time for one phase of the sine wave to occur. In Russian stim Burst Duration is synonymous with Phase or Pulse Duration = how long the burst lasts (normally between .4 to 50msec).