The Eachine Wizard is the best copter you can buy for $140, but it has significant compromises--mostly in the realm of durability--to get to that price point. If you can spend more, you should, but if this is all your budget can afford, the Wizard X220 is a capable flyer... at least until you start crashing it.
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For more about this copter, including how to install the receiver, how to flash to Betaflight and configure, and flight testing, check out the other videos in this playlist: