Package include: 1x motor +1x controller Motor: Output: 500W Rated speed: 2400-2600 RPM Rated voltage: 24V DC Rated current: 27.41A No-load current: ≤2.8A Peak efficiency at 24V: 80 percent Reversible: (w/ polarity swap) Sprocket:11 tooth sprocket for #25H chain Note: This motor is capable of rotation in either the clockwise or counterclockwise direction by reversing the motor's power wires. Controller: Rated voltage: 24V DC Conversion efficency: 95% Under Voltage Protection: 20±0.5V Speed regulator (throttle): 1-4 V Controller Wiring: This controller has 8 connectors, compatible with many 24V bikes with up to 350W motors 1. Battery / 2. Motor / 3. Brake / 4. Brake light / 5. Indicator light / 6. Ignition lock / 7. Charger port / 8. Derailleur (throttle)