Review on DOLPHINDO Ultrasonic Repellent Electronic Warehouse by Jake Yap

Contains six pesticides, each plugged into an electrical outlet. I put two in the garage, one on the patio and one by the front door (yes, two are not in use yet). I waited a month before starting to write this review. They work very well and I have found that there are far fewer (if any) active bugs or spiders in these areas. You can't hear or see how it works, so I can only report the result I've observed.