SG106 22mins Flight RC Drone RTF Optical Flow

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The optical flow sensor and the wifi video feed could be better on this quadcopter as it showed lacking in performance.
The basic functions such as speed and stability is right on par with a beginner level unit.
The flip function only will work in the roll so left flip and right flip only and no forward and rear flips. It also moves towards the rear as it performs the flips and continues to do flips by itself at times which could cause loss of control and thus damage to the quadcopter.
Here are other recommended quadcopters in the same category.