The REDARC Tow-Pro Elite is the only brake controller available with 2 types of braking modes at the turn of a dial, and it comes with a free switch insert panel (TPSI-001) to suit most vehicles. Tow-Pro Elite is suitable for 12 and 24-volt systems. All-Weather, All-Terrain PerformanceChoose what braking type best suits the road conditions, vehicle type, or driver preference. Proportional Mode uses inertia sensing for highway conditions, and User-Controlled Mode is suited for off-road. Advanced Brake Controller TechnologyThis model features a three-axis accelerometer which can measure acceleration in any direction. The main unit can be mounted in any orientation, out of sight and still sense the brake level accurately. The award-winning Tow-Pro Elite also comes with self-leveling technology, so it can sense the rate of deceleration and features active calibration that constantly monitors the vehicle's direction of travel with or without a trailer attached. The REDARC Tow-Pro Elite control knob is designed with low-profile, shock-absorbing elastomers ensuring it can be installed in crash-impact zones. Tow-Pro Elite also comes with a free universal pigtail wiring harness included as standard. User-Controlled Mode is suited for off-road Three-axis accelerometer measures acceleration in any direction Self-leveling technology senses the rate of deceleration | Tow-Pro V3 Electric Trailer Brake Controller, Dual Brake Modes