Suitable for electric bicycles, scooter. Great replacement for Kugoo M4. None Features: [Motor Controller] Made of high intensity aluminum alloy material, shock-resistant and durable. Intelligent design provides steady speed and sensitive control of braking and direction changes. Solid metal can effectively protect 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 high quality plastic material, high strength and durable in use. Easy to install and remove without damaging the scooter, fixed firmly and reliably. Compact size and lightweight, no additional burden to the scooter. Specifications: [Motor Controller] Material: Aluminum Alloy Voltage: DC 48V Brakes: Low Level Current: 21A Speed Set: 1.1-4.2V Dual Mode Item Size: 10 * 6 * 3cm / 3.9 * 2.4 * 1.2in Item Weight: 249g / 8.8oz [Instrument Display] Material:Plastic Hole Diameter: 2.2cm / 0.9in Item Size: 12.5 * 11 * 3cm / 4.9 * 4.3 * 1.2in Item Weight: 118g / 4.2oz Package Size: 15 * 10 * 10cm / 5.9 * 3.9 * 3.9in Package Weight: 367g / 12.9oz Type A Package List: 1*Motor Controller Type B Package List: 1 * Motor Controller 1 * Electric Scooter Instrument Display