Review on 🔌 Anker 18W USB Wall Charger with Quick Charge 3.0 and Quick Charge 2.0 Compatibility - Powerport+ 1 for Anker Wireless Charger, Galaxy S10e/S10/Plus, Note 9, LG G7/V40/V30, iPhone, iPad and More (2-Pack) by Stephanie Smith

I've seen many other reviews mentioning this charger's hum under load, but they've had countless products from Anker and never had one Problem. I chose to ignore it and got these to power my Anker wireless chargers for two iPhone 12 Pros. Unfortunately, coil whistling is actually an issue with both chargers in this two-pack. The coil's whistle is loud enough that I can hear it in a 15-foot-wide bedroom, and it's high enough to be heard even against white noise. Given that this is the most recommended charger for these Anker wireless chargers, I find it hard to believe this is a widespread issue and more of an intermittent quality control issue. I can reorder and see if the next two packs have the same issues, but my hopes are low.