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This is a spare SH1.0 4-pin to USB-C adapter for BetaFPV flight controllers that use the small plastic plug instead of a soldered USB port. It is the same adapter BetaFPV ships with its Air Series 4-in-1 and F4 12A boards, sold as an extra so you can keep one on the bench and one in your bag. The plug keeps the board light, but it is easy to lose and easy to damage, so a spare is the point. It only fits boards with that SH1.0 connector, not older micro-USB or USB-C boards.
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This is a USB-C adapter with an SH1.0 4-pin plug. It connects to the SH1.0 port on BetaFPV flight controllers so you can plug the board into a computer.
The flight controller itself carries only a light plastic SH1.0 plug, so you don't need a heavy metal USB plug on the board. Using this adapter with the controller can save about half a gram on a build.
Many newer BetaFPV flight controllers have this plug, including the Air Series 4-in-1 and the F4 12A flight controllers.