In this task, you're given reviews from Amazon's products. Your task is to generate the Summary of the review.

Ex Input:
Cordless unit caused the GFI and trip and not the unit will not charge at all.. Dead.. Nice unit, easy to use takes two tanks with of water to do the job, one for bottom and one for top teeth. NICE UNIT if it was working. I will be contacting the manufacture for the 2 year warranty.

Ex Output:
Update. Unit was replaced by factory. Works great good feedback from Dentist.

Ex Input:
Returned this unit due to the poor quality of the sound. It also has a very confusing way of displaying the channels that I even have a hard time describing so I won't attempt to. Other than what I stated the picture quality was very good.

Ex Output:
Returned this unit due to the poor quality of the sound

Ex Input:
Leaks from cup and cap. Have others that are great but bought two off amazon and they are horrible.

Ex Output:
Have others that are great but bought two off amazon and they are horrible