Turn your Makita 12V lithium-ion battery into a charging port with the 12V max CXT™ Power Source. Mount the Power Source onto your compatible Makita 12V max CXT™ lithium-ion 2.0Ah or 4.0Ah slide-style battery (sold separately) and you get a USB charging port for portable electronic devices. For added convenience, the built-in clip attaches to a belt or holster. The Power Source can also be used with a 12V max CXT™ battery to power a Makita 12V max CXT™ Heated Jacket, including models CJ102DZL, CJ102DZXL, and more (jacket and battery sold separately).