Mophie Powerstation XXL external battery - 20,000 mAh. Micro USB charging cable, three USB-out ports - 1.0A, 2 x 2.1A.
As-new, in original packaging - all in excellent condition, incl User Guide.
This was a gift but I have no use for it and it has been used only 3-4 times. No point just having it sitting around here.
According to the box, it will charge devices or add +20 hours running time to a large tablet, +28 hours to a small tablet and +100 hours to a smart phone.
$39 incl. postage. Lowest new price appears to be $121.
https://www.bhphotovideo.com/c/product/1286421-REG/mophie_3565_powerstation_xxl_space.html/overview