Feature: 1. Compatibility: This controller is suitable for QS 138 4000w medium drive motor, which can be used for electric scooters and electric motorcycles. 2. Main Function: Effectively control the motor, significantly enhance the motor speed, and increase the motor power. 3. Strong Power: High power controller effectively improves the efficiency of work, powerful start and low motor noise. 4. Stable Performance: The controller not only protects the battery and extends its life, but also increases the driving distance. 5. Features: Sine wave controller, stable effect and not easy to fluctuate, powerful protection features bring you safe use results. Specification: Item Type: ECU Sine Wave ControllerMaterial: ABS, metal1. Available Battery Voltage: 72v 2. Maximum DC Current: 150A 3. Current DC Boost: 200A 4. Peak Phase Current: 490A 5. Maximum Power: 12960w 6. Mosfets Details: 24 field effect transistors 7. Supporting Motor Rated Power: 3kw-4kw 8. Maximum Efficiency: 88% - 93% 9. Waterproof Grade: IP67 10. Certification: for CE, for CCC 11. Work Communication: for Hall Sensor 12. Computer Programmable Support Default Features: for Hall plug, reverse, 0v low brake, throttle (0-5v), 12v high brake, ignition, single wire/for Hall meter wire, program port, three speeds, sport mode, park, anti theft, charge regeneration, weak magnetic current.Application: This controller is suitable for QS138 4000w medium drive motor, which can be used for electric scooters and electric motorcycles.. Package List: 1 x Sine Wave Controller3 x Wire Harness7 x Screws1 x Cover