it is a keeper [SEP] this little unit has the power all right it felt like needles hitting my gums i used the soft setting and it was painful also the water tank ran out in less than seconds so i had to refill three times for the first use i will try it again and hopefully it will not hurt otherwise it may be returned to the company oh and it arrived in an envelope not a box the inner box was a bit squished no other apparent problems thoughafter using this little unit for a couple of weeks i have decided i like it after all you do have to refill it a couple of times if you are like me and take your time it has kept its initial charge from the second day i had it for at least weeks now without recharging very powerful almost too strong for me at first but i adjusted to itit is made in china which i would prefer an american made product but this is what i could afford it seems sturdy enough and definitely powerful enough to do a good job