Yes. The 50S main unit is compatible with the clamp kit for the 30K and 20S EVO. The clamp kit for the 50S is the same clamp kit for the 30K and 20S EVO (manufactured after August, 2019) and provides better water protection for the gold pins compared to the original clamp kit for the 30K and 20S EVO. However, it is recommended to use the main unit of the 50S with the clamp kit and speakers that come with the 50S to get louder, clearer and better bass audio than the speakers that come with the 30K and 20S EVO.
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