Features: [Motor Controller] Made of high intensity aluminum alloy material shock-resistant and durable. Intelligent design provides speed and sensitive control of braking and direction changes. Solid metal can effectively the internal circuit and facilitate heat dissipation. Durable cable and interface ensure a low failure rate when used for a long time. [Instrument Display] Made of ABS material high strength and durable in use. LCD display instrument compact size and ultralight wear-resistant. High and low resistance can be used in -20℃-60℃. Easy to install with the 2 meters cable suitable for 2.2cm diameter handlebar. Specifications: [Motor Controller] Material: Aluminum Alloy Volts: DC24V-48V Power: 250W350W Lower Bolts: DC19V30V40V Current Limiting: 13A Degree Brake: Low Angle: 120°/60° Size: 8.9 * 5.2 * 3 cm / 3.5 * 2 * 1.2 in [Instrument Display] Material: ABS Cable Length: 2 meters / 6.5 feet Hole Diameter: 2.2 cm / 0.9 in Size: 9.4 * 8.8 * 6.4 in / 3.7 * 3.5 * 2.5 in Package Size: 26.4 * 9.3 * 6 cm / 10.4 * 3.7 * 2.4 in Package Weight: 456 g / 16.1 oz Package List: 1 * Motor Controller 1 * Instrument Display