1. 30A Brushless Speed Controller Esc Multicopter KK Quadcopter X-Copter 2. Compatible With: 400-450 Helicopters/Aircrafts Or Quad-Rotor Multi-Rc Helicopters 3. 30A Cannot Be Programmed Because It Has Been Programmed During Production. 4. 30A Yellow Brushless ESC 5. Applicable To F450, F550, Etc. Fixed Wing Four Or Six Axes Output: 30A Continuously, 40A Burst, Lasting 10 Seconds. Input Voltage: 23-Cell Lithium Battery Or 59-Cell Nicd/Nimh Battery. Bec: 1A/ 5V (Linear Mode). Maximum Rotation Speed: 210,000 RPM For 2-Rod BLM, 70,000 RPM For 6-Rod BLM, 35,000 RPM For 12-Rod BLM. BLM: Brushless Motor Note: Different Batches May Have Differences In Product Appearance, Color, And Printed Characters, Which Will Not Affect The Use Colour:yellow Material:plastic Size:about 45 x 24 x 11mm Package Contents: 1 x Brushless ESC