The first science and technology, the first domestic, the first electric remote control.

A fish letter yu static plus Yuxing 4.0 power module 340 package. Perfect pieces! The shortcomings of the United States and China:
. First, compared to the original moc changed the four-wheel drive ratio, so that the original weak wind of the letter Yu Wanxiang Festival more like tofu, crackling broken. Changing gears to lower the speed and change the metal universal knot is the only way.
. Second, The letter yu brick a little tight, hand pain.
. Third, the car stationary placement can not be pushed, otherwise the loss of teeth collapse shaft broken parts.