Check the listing for details. CURT 51200 Echo ™ BRAKE CONTROLLER. Condition: New. Listed at 414.95 USD. The Echo ® in-line trailer brake controller is truly a brake control for the modern age. It plugs into your vehicle and wirelessly connects to your smartphone, allowing you to control and monitor all trailer brake activity right from your own device. It comes with a customizable app for Apple or Android. Most things in this day and age can be accessed or controlled from a smartphone. With the Echo ®, that includes your trailer brakes. Echo ® is powered by a Bluetooth enabled system that connects right to your smartphone. Your phone becomes the brake control monitoring unit in the cab of your vehicle. There is no need for extra modules, controls, buttons or knobs. The Echo ® trailer brake controller comes with a custom-designed app that can be downloaded for iOS or Android OS phones.