Very difficult to assemble correctly due to cheap (made in China) thin parts. After final assembly, it was determined that the stern motor would only turn to the left, so the fish would simply turn in a tight circle. The retractable receiver mounted on the bottom of the fish does not match the description. It is very difficult to open the fragile receiver to insert the battery and there is no compartment for weight putty. Of course, due to the very large numbers above the description, the instructions are inadequate and almost illegible. There are decent instructions on U-Pipe. The package does not include batteries, so you need to buy 4 AAA batteries. In general, my grandson was very disappointed because the flight could not be controlled due to a defective rear motor. If the rear engine had functioned normally then this item would have been acceptable even after all other defects.