Truly a waste of time and money. I followed the instructions which tell you to ‘activate’ by placing them in the sun for 6-8 hours. So I put them in direct sun(FLORIDA sun!) for the full 8 hours. They did nothing. I left them in their intended location for 3 days without disturbing them, and they were completely ineffective. Absolutely no improvement. If the Florida sun can’t activate these things, nothing will. Save your money.