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.
1 The number of waves of. 2  of a particular wavelength passing a fixed point per second. 3  The unit of frequency is the Hertz, one per second. 4  The frequency of a signal multiplied by its wavelength equals its velocity, so that electromagnetic radiation of one metre wavelength must have a frequency of 300,000,000. The unit of frequency is the Hertz, one per second. 2  The frequency of a signal multiplied by its wavelength equals its velocity, so that electromagnetic radiation of one metre wavelength must have a frequency of 300,000,000.