Works great for Mr. Cool DIY 12k Works great on my Mr. Cool DIY 12k. I believe on all the newer Mr. Cool's of this model, the USB port has some notches in the side that prevent a direct insertion of the dongle into the air handler unit. Fortunately, its really easy to work around this. Thanks for making a great product! (source: https://www.tindie.com/products/smartlightme/wifi-dongle-for-air-conditioners-midea-electrolux/#product-reviews)