worked for about 4 months without problems. 12 hour shifts, all night in your ears. It's definitely worth $20. If you see everyone looking depressed but able to smile and enjoy an audio book during a grueling, monotonous job, you'll be very thankful for these "plugins". Expect the wiring to eventually fail if you do manual labor and occasionally snag and pull on the cables. It's probably unsafe to dangle wires, better tuck them in your shirt when using heavy machinery. But I will buy more and will continue. You can remove the sleeve and re-solder the wires. definitely. big investment. listening to audio books at work :) become smarter through dummy work.
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