Technical Specifications and Package Contents: Motor Type: Brushless Geared Motor Rated Power: 250W / 350W Voltage: 24V / 36V Speed: Typically assists up to 25 km/h (15.5 mph) maximum, compliant with e-bike regulations in multiple regions.Core Component List: 1x Brushless Geared Motor 1x Brushless Motor Controller 1x Gold Twist Throttle 1x Motor Mounting Bracket 1x Complete Installation Kit & Wiring Harness 1x 38-Link Chain 1x Dual-Function Switch (Horn & Headlight) 1x 16-tooth freewheel 1x Headlight 1x Chainring 1x Rubber Pad Set Note: Battery and charger sold separately to allow selection of capacity based on your range requirements.