Plant smart garden accessory?

Black & Decker PCS10 PlantSmart Digital Plant Care Sensor
http://www.amazon.com/gp/mpd/permalink/m31VKR403HK1C8
http://www.amazon.com/gp/mpd/permalink/m1TW6FXS30SQEW
http://www.amazon.com/gp/mpd/permalink/m2GBLQ100XPFUY
このようなものに従うなんて、、、