design flaw [SEP] this works well but has a major design flaw the on off button and the button that varies the water pressure are right next to each other when you are using the flosser in the shower with your eyes shut so you do not get hit in the eye you often miss the on off button and increase the water pressure by mistake and let me tell you the highest water pressure is hazardous in one case it cut my lipthey should have the two buttons separated or at least distinguished so that you do not mistakenly rivet yourself with high water pressure