High quality materials: The controller housing is made of high quality aluminium alloy with a recessed design, which protects the internal circuitry from the heat load due to good heat dissipation. Multifunctional GD01 display: The GD01 display meter has a of functions to easier to view the data on the panel; the product will show you many useful data on your bike while riding. Function description: On/off button, up button, down button, battery level display, throttle symbol, 6 km/h thrust assist, brake symbol, cruise symbol, distance travelled, total distance, backlight and headlight, power assist sensor symbol, etc. Wide range of application: 30A controller kit for 1000W motor, suitable for DIY e-bikes, electric bikes, electric , folding bikes, etc.; easy to maintain, can improve riding fun, suitable for cyclists who like challenges. Retrofit controller kit: Bicycle Li-ion battery retrofit controller kit includes 30A controller + GD01 display meter + 130X thumb throttle + 8C boost sensor. Color: As Shown Material: Aluminum plastic Package Contents: 1 x controller 1 x display 1 x Booster 1 x Throttle Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.