Brushless Motor Controller JH4AJ3968DZMN-D 48V 25A Suitable for electric bicycles, mountain bikes, electric scooters, etc. This product uses the 5S protocol. If the controller protocol does not match, it may cause error codes to appear on the display! Please contact our customer service before purchasing a controller. Send us photos of your original controller’s label and connector. We will send an order confirmation within 12 hours. Q: Why do I need to provide a photo of the controller label? Q: Can I use your controller if my model differs from yours? A: Different controller models use different communication protocols. Replacement is possible only if the communication protocols match. Typically, e-bike controllers consist of connectors for the power supply, motor Hall sensor wires, brakes, throttle grip, pedal assist sensor, bike headlight, and motor. As long as you can modify the controller connectors (we can assist with this modification), our controller can replace your original one. Q: How do I find my controller model if I don’t know it? A: Send photos of the controller label and display screen serial number to our online customer service. We’ll identify your controller model and recommend a suitable replacement.