Review on 🐾 MAGIC CAT Ultrasonic Rodent Repeller: 3-in-1 Pest Control Device - Get Rid of Mice, Rats, and Squirrels - Effective Mouse Blocker and Rat Deterrent with Ultrasound Pressure Wave - Humane Indoor Pest Repellent Solution by Jacqueline Mclaurin

Options to check: Thickness, Usability, and Heat. Well, two of them don't apply and all you need to know is that they don't work. I put it in my unfinished attic where the rats nested. I wasn't expecting it to go through the ceiling or walls so I used an extension cord to try it out. The first night I thought I'd nailed it and paid an electrician to install an outlet in my attic just because of this useless product. Since then, the creatures have been having fun as if nothing bothers them. I would say I placed it in the optimal spot with no barriers and my house is a small cottage so range wasn't an issue.