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Our USB Boost Adapter is the ideal accessory for powering your Cooling Fan Jacket with a power bank. It features fast and efficient charging technology, with a powerful output of DC 7.2~8.4V, and is designed with a USB 5V input. The adapter provides reliable protection against overcharging and overheating, ensuring your Cooling Fan Jacket and power bank are always safe and secure. Whether you're going for a hike, attending an outdoor event, or simply running errands on a hot day, our USB Boost Adapter will keep you cool and comfortable.