This product ships without a power bank, so you can use your own.
If you need a power bank, you can pick one below.
Glovii heated universal belt with USB input, Flexwarm, 5 W, 70-140 cm Product code: GB1U  A belt that heats the back for twenty hours. With a 10000 mAh power bank on the lowest level it runs longer than any other Glovii product. The hook-and-loop fastening fits it from 70 to 140 cm of girth.  The Flexwarm heating element sits at the back of the belt and covers a large area of the back. You take the power from any USB 1 A power bank. The set includes an extra extension belt for larger girths.  Key features
 Technical data
 In the box
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