So I tried out the free part of it by putting water on my palm and then rubbing it at the base of the phone, before this I had noticed a small bit of dirt caked up in the speakers, immediately after starting it the crackling had begun and water was spat out onto my palm again. After finishing I had noticed dirt on my hand and then looked at the speakers, which had ejected a major amount of dirt, and this is just the DEFAULT frequency, imagine what the paid version could do! Perfect 5 stars and I would recommend to phone cleaners or people who need it cleaned. Thank you!

They give five seconds of time as daily allowance of “free trial,” which if you click start button catapults user to app’s “speaker check” page and instantly autoplays clarion (and likely unlicensed) sounds of a very popular pop song everyone’s heard but few could actually identify by artist or title. For five seconds. After which a pop up sternly informs user they’ve exhausted their allotted daily free time , please pay before proceeding. From there no matter what button is pressed, even the pay ones,this pop up reappears, tediously, just like the simultaneously cutting in and out of said pop tune until exasperation and defeat win out over attempts to purchase. Leaving would-be users bereft, often finding themselves writing their first-ever review for an App Store. So not sure what this app actually does except waste time effectively, and frustrate, but let’s hope it’s at least as good at uninstalling.

I accidentally washed my phone with a load of clothes and 12 hrs later the speaker still sounds very muffled . Something told me to check the App Store so I clicked the first thing I saw . I started the free trial out my phone face down and after about 45 sec the muffled static that was playing when the 165hz began just went away . I put my movie back on I was watching and the speaker was fixed !!! Wow thank you