Meet the Echo Mobile Electric Brake Controller: a Bluetooth enabled brake controller that simply plugs into your trailer’s 7-way connection and lets you use your phone for brake control. It has a 3-axis accelerometer and connects to your iPhone or Android device via Bluetooth.
More gadgets like this: here
This gadget can be moved from one vehicle to another easily. The companion app lets you manually apply brakes, calibrate, and do a whole lot more. You also get overload notifications during your travel.
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