Features: LCD display functions: Speed, power assist mode, power indicator, fault indication, total mileage, single mileage, headlight display, single riding time. Controller/setting functions: Power switch, headlight switch, 6km/h assist control, wheel diameter setting, maximum speed setting, automatic sleep setting, backlight brightness setting, voltage setting. Suitable for electric bikes and scooters with 22mm handlebar diameter. Great replacement for 250W/350W electric bikes and scooters. Specifications: LCD Display: Material: ABS Communication Protocol: UART Waterproof Grade: IP65 Size: 8.2 * 4.8 * 4.3cm / 3.2 * 1.9 * 1.7in Clamp Diameter: 2.2cm / 0.9in Controller: Material: Aluminum alloy Size: 8.9 * 5.2 * 3cm / 3.5 * 2 * 1.2in Voltage: 24V-48V / 36V-60V (optional) 24V-48V: Power: 250W/350W Lower Voltage: DC20V/30V/40V Current Limit: 13A Angle: 120/60 36V-60V: Power: 250W/350W Lower Voltage: DC30V/40V/50V Current Limit: 13A Degree Brake: Low Angle: 120/60 Package List: 1 * LCD Display Panel 1 * Controller