Docooler New HJ MWC X-Mode Alien Multicopter Quadcopter Frame Kit (Red & Black) Center lower plate: 1-4pcs 45 * 45mm flight control board (FF, kk, rabbit, pirate, MWC, etc.). With Extend board, the ESC parallel plates or 4-in-1 ESC can be installed on it. With mounting holes for Wireless Transmitter, CCD, OSD, GPS antenna, special design for installing NAZA flight control (long hole left for VELCRO to fix the controller), holes for tall landing skill. 2200mAh battery can be fixed at the end of the lower plate. Center upper plate: with cross holes for mounting NAZA GPS and aluminum mounting plate (38 * 38/33 * 33) in front of it for FPV camera. Transmitter or remote control receiver and other components can be set at the end of the plate. Arms: similar arms with F450, F550. Biggest propeller can be used: 12-inch, usually we use 10.11 inch ones. Recommended motor: 2212.2216.4006.5005.