Butterfly Muscle Pain Massager/Reliever

Pros: The patch is pre-sticked, so you don't need to jam with that soiling fluid other devices similar use.
Came with two AAA batteries included. Can work with rechargeable, which is a good thing.
Autostops when the program finished, so you don't have to worry for getting asleep with it on.

Cons: Very cheap build.
The two batteries included are very bad. They weight as paper!
There are not spare patches included.
Sometimes it doesn't respond to the buttons. It's like if it had to rest some seconds after the autostop.

Other: Actually was my wife who ordered this. For me it's the kind of thing you use a couple of weeks and ends forgotten on a drawer. Anyway, at least, is unexpensive.

Pros: - it surely make you muscle spasm and even hurts a bit if you absorb the maximum current unexpectedly.
- a few programs and levels you can set, very nice. i use low frequency for abdomen and high for biceps.
- good build quality. not sure if it will survive a fall, but is durable.

Cons: - sticker will surely wear out in a few weeks/months. no spare one and that a shame.
- the ultimate question of whether this thingy can build muscle or burn carbs.

Other: what i can tell you is that while building muscle require much harder strain, activating your muscle repetitively even from external source can change the membrane potential so probably consume ATP for repolarization. therefore energy is used near the muscle... wouldn't write a PhD about it but that's what i tell myself :)

Pros: Really powerfull, uses 2 AAA batteries that are included so you can use it right out of the box. Very funny to watch your muscles contract... I'm a doctor and i'm thinking about bringing this product and a similar but smaller one i have to the anatomy class i teach so that my stundent can really learn how each muscle contracts

Cons: You have to place it right on top of the muscle you want to contract otherwise you are just going to feel a tinggling sensation and nothing more...

Other: It's rather funny to watch your muscles contract without any effort from your part. Try not to over do it because even if you are not tired your muscles WILL be sore the next morning

Pros: very powerfull, only 2 AAA batteries that are included The patch is pre-sticked, so you don't need to jam with that soiling fluid other devices similar use. Came with two AAA batteries included. Can work with rechargeable, which is a good thing. Autostops when the program finished, so you don't have to worry for getting asleep with it on.

Cons: Very cheap build. The two batteries included are very bad. They weight as paper! There are not spare patches included. Sometimes it doesn't respond to the buttons. It's like if it had to rest some seconds after the autostop.

Other: what i can tell you is that while building muscle require much harder strain, activating your muscle repetitively even from external source can change the membrane potential so probably consume ATP for repolarization. therefore energy is used near the muscle... wouldn't write a PhD about it but that's what i tell myself :)