Mini Power Bank 300mAh Portable Micro USB Port Charger Black

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Features: * Specially designed for wireless BT earphones, earbuds and headphones with Micro USB ports. * 300mAh capacity power bank can charge your wireless BT earphones for 5 times. * Made of high-quality plastic material, durable and shock-proof. * Mini size and lightweight design make it portable to carry. * Built-in smart chip automatically matches the rated voltage and current of the earphones without harm.