510 Thread Battery Unit (Rechargeable)

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The Willo-perfect unity of aesthetic and technology!   Product Description:   510 Thread 650mAh Large Battery Capacity Smart Circuit board with Overheat Protection Usage Instructions:   THREE (3) Working Voltage Options:   3.4V 3.7V 4.0V Click the button 3x to change the voltage. You will see a corresponding light flashes 3 times when voltage is changing   Click 5x to power device on or off.   Charging instructions:   Charges through Micro-USB Please note: *Charging cable is included. Caution: keep out of reach of children.