This product is 3 in 1 productEar WarmerBluetooth head phonePower BankEach function are Independ and can use at same timePS: If turn on Ear Warmer function and Charge your cell phone at same time, your cell phone will charge very slowly, because most of energy are used by Ear WarmerPS: You can charge your cell phone and listen music at same time, but USB Line locations is not good. We will improve at next generation
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