[High Safety] The wires and interfaces have good contact to low malfunction for long time use. Meanwhile, the over/under voltage protection, over current protection, over load protection, over heating protection, anti-runaway protection, locked-motor protection make this kit safe and reliable. [Labor-saving] You don't have to pedal your bike laboriously anymore with this product and only need to gently rotate the turner to control the speed flexibly, which is very labor-saving and convenient. [LCD Display] The LCD meter with color screen can clearly allowing you to grasp the usage statues of the product. Meanwhile, backlight enables you to see screen clearly in dim environment. [Wide range of applications] The controller is a sine wave three-mode controller, matched with Hall and non-Hall brushless motors, with self-learning function Applicable to 36V1500W 36V2000W 48V1500W 48V2000W 52V1500W 52V2000W brushless motor Hall and without Hal [Protect safety] XT60 plug. This plastic box is made of Insulating material, not easy to burn, fireproof, accurate Keep battery safe. Colour:As Shown Material:Plastic+Metal Package Contents: 1 * Controller 40A 1 * Instrument 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.