1) taps self-hydropower, free plug-in 2) very healthy and convenient 3) easy ... beauty, freshness, health, and to remove organic pesticides, free plug-in, battery-free, an ideal home ozone washing water ... once turn on the tap, you can use. Features:1) taps self-hydropower, the world's first free power ... supply, battery-free, free plug-in2) Easy to install, do not drill the wall ...