The T20 wireless headphones are designed around RHA’s DualCoil driver which offers up high-resolution sound reproduction.

There are a ton of headphone makers on the market and some of them have strong and loyal followings, like RHA. The company’s T20 wired in-ear headphones have had a loyal following and now they are being offered as the T20 wireless headphones.
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https://techaeris.com/2019/06/20/rha-announces-its-new-t20-wireless-headphones/