The Curt Echo Mobile Brake Control, No. 51180, is a portable, plug-and-play device that links to the driver's smartphone to control and monitor all trailer brake activity. The Echo features Bluetooth technology to wirelessly connect to the driver's smartphone. With the downloadable Smart Control app for Apple or Android phones, the Echo monitors the trailer brakes, allows for manual control and sends status updates, all using the driver's smartphone. The Echo is designed to be portable for use with multiple vehicles and trailers. It easily plugs in between the 7-way RV blade connectors of the vehicle and trailer. The app is able to store multiple user and trailer profiles, and the device is constructed for long-lasting weather resistance.