The negative reviews about this device I can not understand! One should heed the advice, the hole for inserting a stick or what vorzustechen like, so that the wall is compressed! It took me two days and then all excavations were set! The solar unit, what I had in front of it, provided this does not result by far! This device works absolutely unobtrusive and can be perceived from the outside only by the green cap in the grass. I'm curious to see how long I can keep Buddelflink and Co. from the neck to me with this part.