The RF product naming is typically used by non-bluetooth headphones to prevent confusion, so don’t be confused by this one. The TrebLab RF100 is a pair of bluetooth [see Wikipedia on Bluetooth frequencies and such] exercise earphones and they are currently unlocked at members-only Massdrop for $36 plus $3~ flat shipping.
They are expected to ship in early February 2017, and the offer runs for the next eight days. This model has 16 customer reviews at amazon.com while their more popular XR-series models have 2300 and 1063 customer reviews respectively. They average 4.2 to 4.6 out of 5 at Amazonia.
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