Pair of FiiO LC-78A adapters for connecting an MMCX cable to 0.78 mm 2-pin earphones. Single-piece copper, 6.5 mm in diameter and 0.3 g per adapter.

The LC-78A converts a 0.78 mm 2-pin socket into an MMCX socket. This lets you connect an MMCX cable to earphones fitted with 2-pin connectors. The set contains one pair of adapters and an MMCX tool.
Each adapter is machined from a single block of copper, for reliable signal transmission. It measures 6.5 mm in diameter by 11 mm in length and weighs 0.3 g. FiiO guarantees compatibility with its own 2-pin earphones.
Data sheet
Specific References
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