It is power tool Battery Adapter is compatible with for Milwauke M18 18V battery / for DeWalt 20V MAX Lithium ion battery convert to Milwauke 12V Lithium battery cordless power tools, which means you can use for Milwauke/Dewalt 18V-20V li ion battery to replace for Milwaukee original 12V lithium battery tools as normal. It is easy install and use convenience, black color, High quality, DIY battery converter. Let you Enjoy the benefits of extended run-time of Lithium-Ion Batteries on your existing 12V tools.