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This is a great beginner ab stimulator. It really works to stimulate ab muscles. You can choose different pulse settings and it does strong enough charges that I could still turn it up more, but it is too painful at the highest levels. As long as the gel pads are applied correctly, the charge goes from very subtle pulses, to very strong ones that force the muscles to contract. When it goes too high or the pads are not correctly attached, it does feel more like a shock. Overall, it works great and especially worth it for the low price. See below for info on replacement parts and how I upgraded.I used this stimulator for a few years before the large pad wore out to the point that it would no longer emit a charge. The smaller ones still work and so do the blue rechargeable stimulators. I replaced the sticky gel pads a few times with the generic gel pad replacements, which was easy and cheap. Recently, I bought the FLEXTONE replacement pads, which includes the full piece (not just the sticky gel pieces), and it fit the blue pulsing stimulators perfectly. I wish I had replaced it sooner because the original FLEXTONE stimulator sells for $169-189, and the replacement pads are only $22.99. The FLEXTONE pads definitely work better as far as the strength and quality of the pulses. It was definitely worth the upgrade.

i'm still fat but i'm also lazy and don't do any other workout i just use this :)

Es muy fácil de usar y se puede utilizar no sólo en las zonas señaladas, quedo satisfecha con el producto

I haven't found any direction on how to attach the charged batteries to sticky side.

Not a muscle builder. Only a tins machine.