Ultrasonic Pest Repeller Electronic Repellent Reject Plug in for Insect by, Mouse, Rats, Spiders, Fleas, Roaches, Bed Bugs, Mosquitoes, Eco-Friendly, Human & Pet Safe Pest Control (4 Pack)

Difficult to know .seems to work aiithough not 100% as advertised.

Still have evidence of mice so no not impressed

So far, so good, but I don't like to speak too soon. Only time will tell.

Mainly mosquitos. No bites.

Bought this product and despite reservations the plug would work it is amazing. I have put eight around the house upstairs and downstairs. We have the occasional bee and fly coming in but nothing like we had last year. Bought initially to prevent our dog around wasps as he was stung. This product is amazing can't believe it.

Just brilliant and did the job