It is Huawei Fast Charge protocol.
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The battery compartment of Huawei FreeBuds Pro has two charging methods: line and wireless, and both support Huawei's fast charge protocol.
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At present, the mainstream fast charge protocols on the market mainly include: Qualcomm QC fast charge protocol, USB PD fast charge protocol, Huawei FCP\/SCP fast charge protocol, OPPO VOOC fast charge protocol and so on.