nMhSnn [DFRM37] What is nMhSnn. Likes: 1351. Shares: 676. Curt Echo Wireless Trailer Brake Controller - 1 to 2 Axles With no wiring, modules, or knobs to install, setting up the Curt Echo is a breeze. Just download the Echo Smart Control app on your Apple or Android smart device and follow the in-app instructions. The brake control unit plugs into the 7-way at the rear of your vehicle and provides a port for plugging in your 7-way trailer connector Access Denied - LiveJournal We would like to show you a description here but the site won’t allow us.Learn more