These are perfect for our AT&T phones. I purchased the kit in January 2016 and all three worked flawlessly until a few weeks ago in November 2017 one phone on hold had a low battery which meant it went uncharged for eight hours when I was using the others room where I worked. It's been in use for almost two years, which is good. So today I bought another set to replace the ones I bought in January 2016.
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