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Specification: 1. Continuous current: 40A 2. Burst Current (>10s): 55A 3. BEC output: 5V 3A 4. BEC mode: Linear 5. BEC Output Capability: 5 Servos (2S Lipo) / 4 Servos (3S Lipo) 6. Battery Cell: 2-3S (Lipo) / 5-9 cells (NiMH) 7. Maximum speed: 210000 RPM (2 poles motor), 70000 RPM (6 poles motor), 35000 RPM (12 poles motor). 8. Usage: Apply for 400/450 helicopter 3D, and 32 level fixed wing sports 9. Weight: 39g 10. Dimension: 68mm x 25mm x 8mm Package includes: 1 x RipaFire 40A Brushless Speed Controller ESC Please note:Sold only by RipaFire,RipaFire company never sold these items to other vendors, be careful! Our products have been tested, if any problem, please contact us at the first time so that we can supply the best service for you.