This is a Replacement Wall Charger for the Micro-Start XP-1 and XP-10 (Gen 1 models), XP-10-HD, and older XP-3 models*. This cable allows you to charge those Micro-Start models from an electrical receptacle – it works for 110V-220V.
* The original XP-3 design and the first release of its new design (both pictured below) have a 15V input. The current XP-3 is recharged solely by USB and cannot use this cable.