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.
What is the definition of Cutoff Frequency? Cutoff frequency is generally used in the physics and electrical engineering fields. It is also known as corner or break frequency. This frequency is responsible for making a device to cease functioning in a proficient way, leading it to discontinue or shut down.