The 17A controller kit is suitable for 250W/350W motors. And suitable for DIY electric bikes, electric cars, electric , folding bikes, etc. The bicycle lithium battery conversion kit greatly enhances the driving and is suitable for bicycle enthusiasts. Packing list: Bicycle -ion battery conversion kit including 17A controller, GD01 meter, 109R thumb throttle,8C boost sensor+One to two lines. Excellent features: During driving the product displays a lot of useful data about the bike, such as on/off buttons, light switches, battery level indicator and other functions. The instrument has a display. Excellent performance: The GD01 meter is made of high quality ABS material, which is light, strong, well made, tough, waterproof and provides excellent protection for the internal circuitry. Good heat dissipation: The controller housing is made of high quality aluminium alloy with a recessed design, which protects the internal circuitry from thermal loads due to good heat dissipation. Colour:As Shown Material:ABS+Metal Package Contents: 1 * 17A controller 1 * GD01 meter 1 * 109R thumb throttle 1 * 8C boost sensor 1 * One to two lines 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.