Review (1/5): Horrible design, mouth sores!
Hands down the worst heap of crap i have ever purchased on Amazon and this is saying something.
Mouthpiece WAY too small. It is hard plastic. Not soft, not pliable. Maybe this is a childs version? I spent some time soaking in hot water and opening up the curve of the mouthpiece extensively to where i could simply close my teeth on it although the fit was still far from acceptable.
Once i was able to use it, I found that the power source is a nuisance to switch on.
Why have an external battery hanging off a cord? What if somebody wants to use it while sitting in a bath? The battery is prone to getting submerged. Make the battery and mouthpiece all self-contained like some other brands.
Now, even worse than the ridiculous fit of the mouthpiece, the damn sores in my mouth! Ulcers on the insides of my lips after one use. ULCERS!!
Do not buy this product. Mine is going straight in the garbage.