[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 models. Fits 12-volt cordless tools. Battery not included. [Safe Protection] Solid design made of plastic material. Resistant to high temperature, wear, and impact. Portable and easy to use. This product is a battery adapter only. It is not a charger, battery, or power tool, and cannot recharge batteries. It is designed solely for converting battery compatibility between tools. Due to different production batches, labeling may vary and is random. This does not affect functionality or performance. Note: Installation guide not included. Professional installation is recommended. Please verify compatibility before purchase. Product design may be updated periodically. Slight variations in appearance or color may occur due to batch differences. These do not affect use. Color: Black Material: Plastic Package Contents: 1 x Battery Adapter (adapter only; tool and battery not included) Packaging includes only the items listed above. Note: Lighting and display settings may cause slight color differences between the image and actual product. Measurement error allowed is +/- 1-3 cm.