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.
vb, bursts, bursting or burst. 1. to break or cause to break open or apart suddenly and noisily, esp from internal pressure; explode. 2. (intr) to come, go, etc, suddenly and forcibly: he burst into the room. 3. (intr) to be full to the point of breaking open. 4. (intr) to give vent (to) suddenly or loudly: to burst into song. 5. (Pathology) to cause or suffer the rupture of: to burst a blood vessel.