Compatible With for Milwaukee M12 12V Lithium-Ion-battery. In this product, we have added and equipped a fuse, which can increase the safety of the milwaukee battery adapter. The main role of a fuse is to protect electrical equipment from overcurrent and overheating. Compatibility: for Milwaukee12V(This product does not come with batteries, you need to prepare them yourself) Note: Installation guide not included, we strongly recommend you seek professional installation. Please check as much as possible to make sure the item is what you need. Tips: The product may be updated constantly ,Due To Different Batches, The Actual Product May Have Slight Differences Or Color Differences, Which Does Not Affect Use Specification:Black Plug/Blue Plug Colour:Red Material:plastic<br><br>Package Contents: 1 x Battery Adapter Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.