1. materials Aluminium housing Aluminium material is conducive to good heat dissipation of the controller. 2. Fully waterproof controller is suitable for 250W motor. 3. Suitable for 250W motor. 4. Whether you're refurbishing an old bike or building a new one, this controller meets all your needs. 5. Built to last, the controller withstands rigorous use typical of both recreational and commuter e-bikes. It ensures long-term reliability and performance, making it an essential upgrade for any electric bicycle enthusiast. Due to different batches, there may be differences in product appearance, color, and printed text, which not affect the use. Colour:As Shown Material:aluminum Package Contents: 1 * KT-15A controller 1 * 1T5 wire 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.