It's just ok. Of course, they are tiny and only use 1 battery each. (They only come with a battery, by the way.) But the vibrations aren't really strong. I mean, you can feel them, but it's more like having your hands on a table next to some kind of industrial machine that's vibrating. Almost like an underlying vibration - not a really strong vibration per se. Maybe in that regard, because they are so small, they lose some functionality? I would also appreciate them more if they weren't plastic because who knows what the plastic is made of or the color on the plastic. However, they are quite easy to use. One press of the bottom button and they turn on. More press toggles between different modes and also turns them off. Conveniently, you can always long-press the button, which will turn off the device without having to cycle everything to turn off power. So, okay, but I expected more... If you found my review helpful, please click the helpful button. Thanks very much! Have a nice day! :)
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