None of your product pictures match. Your specifications are wrong. Your videos are very blurry and taken in low light. And since you are not a registered vendor, this is can be considered spam. As for the 8" RK2818, the platform isn't terrible, but certainly is not worth over $200 even with a capacitive touchscreen. You have listed one of the least expensive variants of the RK2818, that also happens to be a clone.
xaueious this video is from my cell phone. i'll make it better and i am not a spam . dont call me spam