Features Support for QC2.0/QC3.0/MTK PE1.1/PE2.0/Apple/Samsung AFC/Huawei FCP/Spreadtrum SFCP Built‑in synchronous switch step‑down converter chip, conversion efficiency up to 97%, output voltage wired compensation function The output voltage range is 3V to 12V, which can be automatically adjusted according to the fast charge protocol With output over‑current, input over‑voltage, input under‑voltage, output short‑circuit protection, over‑temperature protection of the whole machine Can be used in a variety of scenarios, such as car chargers, fast charge adapters, smart plugs, solar chargers Specification: Item Type: DC Buck Converter Input Voltage Range: 6V-32V Output Voltage: Default 5V, Automatically Adjust Between 3-12V After Triggering Fast Charge Output Power: Maximum 24W (5V@3.4A，9V@2.5A，12V@2A, etc.) Conversion Efficiency: 90%-97% Protection Function: Input Over-Voltage, Under-Voltage Protection, Input Over-Current Protection, Output Over-Current, Short-Circuit Protection, Over-Temperature Protection of the Whole Machine For BC1.2/ Apple/ Samsung Protocol: Support For Qualcomm QC2.0/ QC3.0: Support For MTKPE1.1/PE2.0: Support For Huawei Fast Charge Protocol FCP: Support For Samsung Fast Charge Protocol AFC: Support For Spreadtrum Fast Charge Protocol SFCP: Support Package List:1 x DC Buck Converter Module Note:Note: All four USBs support fast charging protocol, and can output 5V 9V 12V. The USB output voltage depends on your device. The output voltage of different devices is different. The conventional USB output voltage is 5V. It can output different fast charging voltages according to the QC protocol. The fast charging voltage of mobile phones is 9V 12V, and some devices support 5V high‑current fast charging, and devices that do not support fast‑charge charging with small current Package List 1 x DC Buck Converter Module