TrollMaster TM201DPRO TrollMaster Pro Throttle and Steering Control - Mercury Mariner and Yamaha 9.9 & 15 Hand held or panel mount controller with water resistant LCD display Momentary full throttle burst control Engine specific hardware fits neatly under cowling Works with all Panther brand Electro Steer units 1-year warranty Hand held or panel mount controller with water resistant LCD display Momentary full throttle burst control Engine specific hardware fits neatly under cowling Works with all Panther brand electro steer units