The 510 Duo VV Concealer 510 Battery having dual 510 thread cartridge. It has four voltage settings 2.5V, 3.0V, 3.5V, and 4.0V. The Duo VV Concealer 510 battery by 510 brand comes with a pre-heat mode. To turn it on, double-click the button rapidly and press it once to stop. Moreover, if you wish to turn the device on or off, click the button 5 times.
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