"What does it feel like?" It uses short DC pulses of current rather than AC so it feels nothing like TENS. The short jolt is not pain-full in it self but it is not pleasant. It's like a quick slap without the after-burn. It causes one to tighten one's muscles in preparation for the next zap, which may or may not come. The anticipation magnifies the discomfort. Random, repeated pulses will quickly wear down my resistance to its influence making it impossible to ignore.
PP