Engage brake controller by Hayes is lightweight, completely time-based, and has a digital read out and direct plug in for added convenience. No leveling is required. Engage trailer brake controller has an output that operates on a time-based circuitry, during braking. The longer the brake pedal is depressed, the greater amount of current is delivered to the trailer brakes. The €œvoltage ramp time€? and power is adjustable to achieve trailer brake responsiveness. The digital display indicates the amount of power being sent to the trailer brakes and can be adjusted to display in three modes (percent of power, voltage, or current). The digital display also provides visual warning of several fault conditions including current limit, short or open circuit, and hazard flash indicator. Easy to use manual slide operates independently of the power settings, to allow full baking output when desired. A "Quick Connect" feature allows for fast and easy installation. For 2, 4, or 6 electric brakes. Includes a lifetime manufacturer warranty. Made in USA