Features: Design for brushless 500-800N electric wrenches, this precise controller board delivers efficient motor speed controller and stable power output with its heat dissipating aluminum housing. Featuring intelligent speed adjustment switching and broad compatibility, it seamlessly integrates with various brushless tool and lithiums batteries systems for versatilitys applications. Ideal for professional mechanic and DIY enthusiasts requiring reliable torques management in industrial maintenance or automotive repair projects. Optimizes performances in demanding workshop environment, from assembly line production to heavy dutys construction site operations. To prevent damage to the motherboards, please follow the requirement. Specifications: Component:ABS+Metal Input voltages: 21V Output current: 50A Size:Approx.6x5.0cm/2.36x1.97inch Package Includes: 1pc Electric Wrench Controller Board note: Please allow 1-2cm errors due to manual measurement. Due to the differences between different monitors, the picture may not reflect the actual item color.