Hi Maria,
Mine is a "1st Choice Plus" available online at Bodyclock (UK website) or Amazon UK. It is strong enough for me. It is plenty strong enough to feel more like a straightforward electrocution between levels 4 and 5. I had a thread from the electro pad loose and stuck between the pad and my skin one day and it felt like is was burning the surface of the skin.
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Jim
2003 L5S1 Charite
1981 L5S1 Discectomy
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