Review on 🔌 4-Pack of Dual Port USB Wall Charger Blocks | Power Adapter 5V 2.1A Brick for Apple iPhone 11/XS Max/XR/X/8/7/6S/6S Plus/6/SE/5S/5C/iPad Mini/Air 2/Android Samsung Galaxy Kindle Fire LG by Brant Skogen

They look good on the web, but when you plug them in they make a loud, ultra-high pitched squeak, like a dentist's drill or an ultrasonic rodent repellent. Looks like the annoying Sound Grenade phone app. I've bought more than one of these chargers and none of them have squeaked when charging. If you are old and have poor hearing at high frequencies, or if you have rodents in your home, then this is a good deal at a low price.