Compatible with 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 Milwaukee 12V (The product does not come with batteries, you need to prepare them yourself) Note: Installation guide is not included, we strongly recommend seeking professional installation. Check as much as possible to ensure 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 connector/Blue connector Color: Red Material: plastic 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 allowed measurement error is +/- 1-3 cm.