XK Alien X250 2.4G 4CH 6 Axis RC Quadcopter One Key to Roll/Headless Mode/One Key to Return High precision air pressure needle to fix height. Fail safe function;One key to roll. Can hang micro 5.8G FPV camera to take picture and video. Control distance is more than 300m;Compatible with Futaba S-FHSS. Low voltage alarm function;High discharge rate lipo battery.