1, 4HP motor, commercial treadmill 2, dual lifting sytem, non shake, most ... -end.More new elements integrated: lower height of treadmill deck, larger running area but smaller space occupied, ... . Tailored motor, inverter, roller, electronic display for treadmill, to create the perfect mode of operationAuto-calibration system ... when change running belt and running deck. 4HP commercial treadmill with TV