Review on SAWMLIA Ultrasonic Repeller Electronic Repellent by Michael Long

I applaud this seller/manufacturer for making the following statements: - "You will be ineffective for other rooms if you install the unit in the same room" -"Make sure that there are no barriers such as curtains or closets that are covered in front of the repellent" These statements are important to know as ultrasonic waves do NOT penetrate your walls. They do not penetrate solid objects. They reflect, they reduce/reduce. This repeller has a forward directional emitter/speaker this is better than others that have rear facing emitters the instructions provided are tiny and short I mean both literally you plug it in and it's off initially you can just press for 2 seconds and it will turn off It has a symbol with L, M, H, but I believe it switches between them automatically - they are different e-frequencies, what a Another plus of this device is. It hits the creatures with a disruptive sound and then switches to a different frequency. I think it's an idea. I have this repeller in my work shed. I don't have any visible rodents so I can't attest to how effective it is. I give it 4 stars as it was accurately described by the seller and as my comparison to competing products. Before using, I suggest you study health concerns. After doing my research, I decided to only use ultrasonic repellers in unoccupied locations.