REESE Towpower 8507111 Brakeman IV Digital Brake Control, Small Compact Design INSTALLS QUICKLY: This 100% solid-state electronic with a small compact design mounts in any direction, no leveling required. Pre-wired plug-and-play feature allows for quick and easy connection to 2-, 4-, 6- and 8- brake systems. ADJUSTS EASILY: Two separate easy push-button adjustment controls (output and sync) allow for not only different trailer weights (output) but also the speed of activation (sync) depending on your driving style. DIGITAL DISPLAY: Bright and prominent digital display clearly indicates the output setting, sync setting, brake overload or short connection. SAFE & SECURE: This device includes advanced internal circuit protection to help prevent damage and is for use on 12-volt negative ground systems only. Includes a limited lifetime warranty.