Features: This 18-21V brushless motor controller delivers powerful and efficient power transmission, essential for tasks requiring sustained performances and robust output. Featuring intelligent temperature control to prevent overheating, broad compatibility with various lithium drill brands for easy installation, and precise speed adjustment to optimize workflow. Designed for professional and DIYer enthusiasts who need long duration operations in high efficiency work environments. Ideal for demanding scenarios like construction, woodworking, or metalworking, where stable operations under heavy loads and adjustable speed for diverse materials are important. Constructed from ABS and metal materials, it ensures light weight portability and enhanced longevity while maintaining consistent performances. Specifications: Component: ABS+Metal Input current: 20A Input voltages: 21V Size:Approx.62mm/2.44''x52mm/2.05''x8mm/0.31'' Suitable for 18 to 21V brushless electric drills Package Includes: 1Piece Electric Drill Controller Motherboard note: Please allow 1mm errors due to manual measurement. Due to the differences between different monitors, the picture may not reflect the actual color of the item.