THE VARI POWER MAX (VPM SERIES) IS THE LATEST ADDITION OFHIGH-PERFORMANCE TROLLING MOTORS that are designed and engineered to be best in class for higher thrust and efficiency ,precise digital variable-speed control, free maintenance digital power system, quiet operation ,great reliability and durability . Vari Power Max gives you the longer run time and with the smaller ampere that you can save much more battery to fish day in and day out. What's special is with the electronic protector technology, the propeller will stop working once it run into a strong resistance (e.g. When weeds or debris wrapped around the propeller in the water, the digital protector works.) Plus, with the digital power system technology, there is less energy loss and the motor do not need servicing, and it greatly extends the motor life. The digital variable-speed control provides precise and smooth speed adjustment when you need them. And the tough stainless steel shafts and units make it virtually indestructible.