1 x Motor (with both T8F sprocket and 35 sprocket). 4 x Sealed Lead Acid Battery 12v 24ah each one. 7.1''(181mm) x 3"(78mm) x 6.7"(170mm). 1 x Forward / Reverse Switch. 1x 35 58T Rear Sprocket (29mm).Model: 48VDC 1800W Brushless Motor. Sproket: T8F 9 tooth and 35 11 tooth. Motor weight: 10.5 lbs (4.8kg). Matching motor: DC Brushless motor. What is the advantages of brushless motor. Less electrical and electromagnetic noise. Long lifespan: No brushes to wear out, around triple lifespan as brushed motor. Low maintenance: No brushes to replace. Powerfrugal: Power consumption is 1/3 of brushed motor.
High efficiency: Brushless motors are typically 85-90% efficient whereas brushed DC motors are around 75-80% efficient. For instruction video, please refer to the below youtube video.