Features1Modification Kit: Electric Bicycle lithium conversion controller kit contains 17A 3 mode controller and S810 display. Suitable for your own DIY modification to meet all needs. 2Controller: The controller shell is made of metal with groove design, which protects the internal circuitry due to good heat dissipation, thus avoiding thermal overload. 3S810 Display: The display is made of ABS material, which is lightweight, strong and durable, with fine workmanship, good toughness and waterproof performance, providing better protection for the internal circuitry and making it more durable. 4Multi Function Display: While riding your bike, this product will show you many useful data on your bike, such as on and off buttons, light switches, battery level display, and other functions, a display that will keep you in the loop at all times. 5Applicable Models: Display mounting caliber 22.2mm, controller for 250W350W motors, for DIY electric bikes, electric scooters, folding bikes, etc.; easy to maintain, lithium bicycle conversion greatly improves the riding fun for cyclists who like challenges.SpecificationItem Type: Bicycle Lithium Battery Conversion Kit Weight: 530g / 18.7oz Material: ABS, Rubber, Aluminum Alloy, MetalApplicable: For 250W-350W motor Controller Size: Approx. 8x5x3cm / 3.1x2.0x1.2inMaximum Current: 171AController Speed Setting: 1.1-4.2VBrake: Input low levelPackage List1 x Controller1 x Display2 x Washer2 x Screw2 x Nut2 x Instruction Manual