... blades sizeDC-12V56B112V36WMetailWhite with groden320rmp56 inch Features 56 inch fan blades; 3 Metal blade5 level controller; 5 speed- ... speed-230RPM, 2 speed-180RPM, 1speed-130RPM;Power method: DC 12V/solar panelPower:≦36W; Current: 1.5~2.5A; ... 8~13VSwitch type:step switchMotor Type: DC current,brushless motorNoise: ≦27DB-Amotor external diameter: 217mmAccessories: Motor, Five speed switch box, Boom, ...