This is a brushless electric regulator suitable for DIY modification, not an aircraft model electric regulator. This electric regulator can be widely used for brushless power systems such as water pumps, fans, knife grinders, hand grinders, electric hand drills, etc. Specification:A:30A Unidirectional/B:60A Unidirectional/C:60A Bidirectional support forward and reverse/D:30A Bidirectional support forward and reverse Regarding load: If the motor load is within 20A, 30A electric adjustment can be selected / For motors with a load of less than 35A, 60A electric adjustment can be selected. (Because the biggest fear of brushless electric regulators is heat generation, forced heat dissipation is necessary for long-term use) Working voltage: 7-24V (2-6S LIPO) Maximum power: 300W Maximum power: 1000W Maximum speed: 224000 RPM (2-pole motor), 74000 RPM (6-pole motor), 40000 RPM (12-pole motor), 35000 RPM (14-pole motor). Color: As Shown Material: Plastic+Metal Package Contents: 1 x Brushless motor driver 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 measurement allowed error is +/- 1-3cm.