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.
Fig. 4 MS bursts. DMR also supports a Reverse hannel (R) which is used for signaling. In the outbound direction the R re-. places the burst center sync field, whereas in the inbound direction a special short burst is used, see fig. 6. For voice transmissions a super frame of use several burst and timeslots, see fig. 7.