17A three-mode controller. Controller kit for 350W motors. And suitable for DIY electric bicycles, electric cars, electric , folding cars, etc. The bicycle lithium battery conversion kit greatly enhances the driving pleasure, suitable for bicycle lovers. Packing list: Bicycle lithium battery conversion kit includes 17A controller, S830 meter, 109R thumb throttle, KT-8C boost sensor, a pair of power-off brake levers Great features: While driving, the product displays a lot of useful data about the bike, such as an on/off button, light switch, battery level indicator, and other features. The instrument has a display. Excellent performance: The S830 meter is made of high-quality plastic material, which is light, strong, well-crafted, tough, and waterproof, providing excellent protection for the internal circuit. Good heat dissipation: the controller shell is made of high-quality metal, with concave design, good heat dissipation, and protects the internal circuit from the influence of heat load. Colour:blackandsilver Material:metalandplastic Package Contents: 1 x controller 1 x instrument 1 x finger handle 1 x boost sensor 1 pair off brake lever 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.