The CURT Echo mobile trailer brake controller is a Bluetooth enabled device that wirelessly connects to your smartphone and allows you to control and monitor all trailer brake activity right from your device. It features a simple, plug-and-play installation, a portable design to easily switch between vehicles and a highly durable construction to outlast the elements. The Echo brake controller brings your towing experience into the modern age. Powered by Bluetooth, it wirelessly connects to your smartphone without any extra wiring harnesses or modules required. Simply download the Smart Control app on your Apple iOS or Android OS device, plug the Echo into your vehicle and you're ready to start towing. The app allows you to create multiple vehicle-trailer profiles for different towing situations. Installing the Echo trailer brake controller is truly a plug-and-play experience. It is designed to insert in between the vehicle-trailer wiring connection and is compatible with any industry-standard 7-way RV blade plug. This design also allows the Echo to be easily transferred between vehicles, making it perfect for fleet vehicles or multiple-vehicle owners. The Echo mobile trailer brake controller is built to withstand the outdoor elements, whether you're towing through rain, snow or sunshine. It features a potted enclosure. This means the interior of the Echo is filled with an epoxy resin that covers the internal electronics and seals them off from dirt and moisture. This promotes long-lasting durability and also helps reduce vibration. To further enhance the connection, the connector port of the Echo is equipped with a retention strap and locking tab to firmly seat in the 7-way vehicle socket. The CURT Echo mobile brake controller operates with a tri-axis circuit for smooth stops going up or down a hill, and it is able to operate up to two to four trailer brakes at a time (one to two axles). It is also compatible with cruise control and ABS brakes.