This product is made of fine materials, light quality, small burden after installation, easy to install, practical, LED display is clear. Features: This display and controller adopt fine quality materials, lightweight, rainproof, sturdy and practical. LED display can clearly show the battery capacity, several buttons for quick operation of speed adjustment and headlight, easy to use. The controller is brushless type, working silently and stably, won't suddenly accelerate or decrease the speed to keep you safe. With a mount on the back of LED display for easy installation, suitable for most handlebars.? Suitable for electric bicycles, cars, scooters. Specification: Type: 24V, 36V, ?48V (optional) Material: plasticsandmetal Power: 250W / 350W Speed model :(1:2:3) 33%, 66%, Controller size: about 86 x 52 x 30mm / 3.4 x 2.0 x 1.2in Display size: 80 x 42 x 15mm / 3.1 x 1.7 x 0.6in Item weight: 300g / 10.6ounce Package size: 200 x 50 x 80mm / 7.9 x 2.0 x 3.1in Package weight: 308g / 10.9ounce Note: controller with power switch module (output battery voltage, power can be connected to 50W) Package List: 1 x LED Display 1 x Controller