pity that the user has been knitted with hot needles. for the safety was texted a lot. why all the technical possibilities have been only sparsely or not at all described? Only through extensive research in forums I could inform me about the different propeller, which must be defined mounted. totally neglected and incomplete was the setup, described the sensitivity settings and Expert mode. until now I have had a lot of joy with the Quadrocopter and the recommendation I can only say even that should be ordered when purchasing both propeller spare battery and reserve, I am very enthusiastic and can only recommend the quadricopter.