
I've been using the plug since it was first introduced in the 1990's. I've been looking for Bluetooth headphones that deliver deep bass in a convenient package for a long time. I just got an email from Koss.com talking about Plug Bluetooth and I knew if they would sound as good as the wired version. very happy. When I received the package I was pleasantly surprised by the quality. My only gripe is that you have to remember the position of the volume knob because unless you're looking in a mirror it's hard to see. My tests consisted of my LG phone music app and on multiple phone calls all parties on the other end heard no problems, everything was loud and clear. Then I tried my LG phone music app and even the tracks ripped to 64k sounded good. and reliable. Then I tried the Rocket Music app on my Samsung Tab A and had to adjust the equalizer because the bass was too strong. But after the equalizer, the headphones sounded great. These headphones are incredibly affordable. Plus Lifetime Koss Warranty. I highly recommend these headphones.

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