leaks terribly [SEP] another design disaster from philips when the old sonicare died i did not feel like buying another since they still use ni cad batteries which were state of the art in the eisenhower era but no longer this portable brush has the potential to be perfect it requires no base no cord no electrical outlet the batteries are always as fresh as you want use any aa batteries rechargeable disposable lithium heck even ni cads if you can find any it is perfect for traveling it can be stored horizontally it takes the regular sonicare headsbut its from philips i read all the reviews about it leaking so i was very very careful and when that did not work i tried running electrical tape around the bottom to make a long story short there are tiny channels that the water still gets in and after a week or so the bottom cap would not even stay on a huge disappointment because i really liked it more than old sonicare now i am hooked on true cordless so i will have to check the other brands