The kit includes: 1. 1x 350W DC UNITE motor2. 1x Motor controller3. 1x Accelerator handle (with battery indicator & key switch) This bike kit is suitable for 20"-28"bike 350W 's max. speed :25-30km/hMotor Specification:Model: MY1016Z3Voltage: 24V / 36VOutput: 350 WattType: Brushed gear reductionSprocket: 9 Tooth only fits bicycle chain 1/2"x1/8"Motor net weight: 2.9 KG