This VVPS requires a separate power supply to feed it power, sold separately, and can only lower the voltage, not raise it higher than the power supply can provide. You will need a 12 or 15 volt power supply with a center-positive 2.1mm barrel plug. VVPS does include (2) three-foot extension cords, so that you have a spare. This VVPS is just called "Travel" because it's so small, but you can use it wherever and whenever you like.
Please read our voltage guide as fire, or damage to your vape, can occur when using more than 12v.