It connects to 4mm spade connectors, as found on the SON hub but not on Shimano or SP hubs. But I have seen a Shimano to 4mm spade adapter, like in this picture:
@Five-Hats started
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It connects to 4mm spade connectors, as found on the SON hub but not on Shimano or SP hubs. But I have seen a Shimano to 4mm spade adapter, like in this picture: