Impulse 31 Deep V Needed to Complete - (2) 2S-3S Li-Po batteries or (2) 7.28.4V Ni-MH batteries with EC3 connector, (1) Dual Li-Po or Ni-MH charger with EC3 charge plug, and (4) AA batteries Includes brushless ESC programming module for additional programming changes Sealed inner liner keeps electronics dry Offset rudder system provides superb stability in all wake conditions while keeping the model glued to the water Propeller strut and rudder are anodized aluminum providing superb stability and durability