LHI Full Carbon Fiber 250 mm Quadcopter Race Copter Racing Drone Frame Kit RTF +Radiolink AT9 Remote Controller& Receiver for FPV(Assembled) Remote Control Default UnlockFirst step: switch openStep two: open up the ABCD switchesThird step: throttle lever to make the lowest throttleFourth step: the throttle lever to lower right corner to keep 5 seconds to complete the unlock,Unlock process CC3D blue light blinks rapidly (reverse this lock) 250 Ready-to-Fly Quadcopter: Most of comments and parts have been assembled already; it is ready to fly after you installed the propellers (included) and plug the battery (included). Full Carbon Fiber frame kit, which is ultralight and great intensity. Support for HD camera, image transmission and other replacement components, you can DIY to change it as you wish. Note: We have pre-assembled the 250 quad and tested it before shipped out. you need to Unlock the Remote Control , we recommended to use 11.5v 35c 1500mah battery.(not include the battery and charger)