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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.