[NEW 2018 UPGRADED] 4-Pack Ultrasonic Pest Repeller - Electronic & Ultrasound, Indoor Plug-In Repellent | Anti Mice, Insects, Bugs, Ants, Mosquitos, Rats, Spiders, Roaches, Rodents - Child & Pet Safe

Very powerful and by measuring to obtain the correct dilution, affordable.As per sale handling instructions, make sure to avoid inhaling the mixture. This is a very powerful insecticide, and quite honestly, smells about 3 times worse than the regular bifen in 7.9%. Makes sense. 3 times stronger, 3 times the odor.I spilled a very, very small amount on cement (read the directions to avoid polluting waterways, and endangering fish and other wildlife). Even after careful cleanup, I could still smell it. I will probably have dreams/nightmares about smelling it.It's worth it. Because of being extra concentrated, a much smaller amount can be purchased making it a very good value.We actually farm organically. We purchased this for an equipment shed that we suspected was getting termites. If you don't catch them early, they can dig in so deep that they cause damage and are almost impossible to completely and permanently eradicate. Then you're being handed insane bills from exterminators who try to sell you a long term contract to keep coming back for follow up. I'm not knocking the profession because if you really need them, they are a truly welcome site and trained to spot pests a normal person might miss. These types of chemicals are no joke, and should be handled with extreme care and caution.If you know how to handle Bifen, and have the equipment and knowledge, this is a product that should be kept on hand. You can't go wrong with either the ingredients or bang for your buck.