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(I) Controller Controller function: Speed control / LCD connector / Speed limited / PAS... Controller dimension: 9cmx5.2cmx3cm ​(II) Twist Throttle Twist throttle function: Speed adjust / Battery indicator / Power lock Twist throttle installation: Cable length 150cm / Mounting hole diameter 22mm/ Fixed and fasten by screw (III)Mechanical Power-off Brake Hanlde Function: Cut off power when brake / Supply mechanical brake power Installation: Wire length 150cm / Mounted and fasten by screw (IV) LCD Display LCD diaplay functions: Speed information / Power / RPM / Battery indicate / 5-level speed can be chosen Installation: Wire length 150cm / Mounted by brakcet and fasten by screw (V)Thumb Throttle Thumb throttle functions: Speed adjust / Battery indicator / Power lock Thumb throttle installation: Wire length 150cm / Mounting hole diameter 22mm / Fixed and fasten by screw