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I prefer this type of detangler, versus the style that just plugs directly into the headset (no small wire between the plug and the swivel). I've used it on my office phone for over 3 weeks, and zero tangles. Previously, I was detangling the wire a few times a day.
I bought these to try and help at work where we answer the phone and have to stretch the cord across the office to stand at our computers. While they haven’t been 100% tangle free since putting these on there has been a great improvement!