Features: The brushless controller provides steady speed and sensitive control of braking and direction changes. Aluminum alloy controller shell can protect the inner circuit due to good heat dissipation feature to avoid thermal overloading. Display panel shows the battery power,0-9 PAS gear level,distance,time,max speed,current speed,average speed,etc.(NOTE: No Backlight Function) With a mount on the back of display panel for easy installation,suitable for most handlebars. Fits for electric bicycles and electric scooters. Specification: Package size: 21 * 11 * 5.5 cm / 8.3 * 4.3 * 2.2 in Package weight: approx. 365 g / 12.9 oz Brushless Controller: Voltage: 24-36V / 36-48V / 24-48V(optional) Lower voltage: (19V/30V) / (30V/42V) / (31V/41V) Power: 250W/350W Current: 13A Suitable motor phrase angle: 120/60 Material: Aluminum alloy Size: 9 * 5.2 * 3 cm / 3.5 * 2.0 * 1.2 in , 8.7 * 5 * 3 cm / 3.4 * 2.0 * 1.2 in Weight: approx. 191.4 g / 6.8 oz Display Panel: Voltage: 36V Material: Plastic Size: 8 * 4.8 * 4.8 cm / 3.1 * 1.9 * 1.9 in Weight: approx. 120 g / 4.2 oz Package List: 1* Brushless Controller 1* Display Panel NOTE: 1.No Backlight Function. Item color displayed in photos may be showing slightly different on your computer monitor since monitors. Thank for your understanding. 2.No waterproof function for brushless controller and display panel,please do no soak into water for long time especially on a rainy day.