[Compatible with 18V Batteries] This MT18 MT12 adapter is compatible with 18V batteries, including BL1860B, BL1860, BL1850B, BL1850, BL1840, BL1830B, BL1830, BL1820, BL1815. It allows use of these 18V batteries with 12-volt lithium-ion tools requiring BL1021B (BL1016), BL1020B, BL1041B, BL1040B, BL1040, BL1015, 197402-0, 197390 CXT for 12-volt cordless tools. Battery not included. [Safe Protection] Durable design made of plastic material with high temperature resistance, wear resistance, and drop resistance. Compact and easy to carry, simple to use. This product is a battery adapter only. It is not a charger, battery, or power tool, and cannot recharge batteries. It is intended solely for mechanical compatibility between specific tools and batteries. Due to different production batches, labeling may vary randomly. This does not affect functionality or performance. Note: Installation guide not included. Professional installation is recommended. Please verify compatibility before purchase. Tips: Product design may be updated periodically. Slight variations in appearance or color due to manufacturing batches are normal and do not affect usage. Color: Black Material: Plastic Package Contents: 1 x Battery Adapter (adapter only, tool and battery not included) Only the items listed above are included. Note: Lighting effects and display settings may cause slight color differences between the image and the actual item. Measurement error allowed is +/- 1-3 cm.