Product Specifications: Assembly size (LWH/mm) Steamboat: 121 61 86 Windmill: 154 153 239 Puppy: 68 46 64 Car: 70 54 34 Airplane: 154 61 94 Rotary plane: 218 61 166 Note: The gear of P3 has been connected to P1 in advance Some people say that the solar panel looks like the line is disconnected. This is what the shop owner tried (the straight line is disconnected by 2 mm), which means that it has nothing to do with this. 1. Connect the two springs of the solar panel (connected with two wires) to the two springs with a small pinion at one end. Do not mistake the positive and negative poles. 2. Under the sun If the small pinion rotates, it means that the two electronic components are no problem. The above two inspection steps are done before installing the plastic parts. The inspection of the first step and the second step is no problem, please don't wrong this solar energy is bad. 1. There is no problem with the two electronic components, that is the problem of installing the plastic parts. 2. The small pinion should match with a larger gear when it is installed (there should be no gap in the middle), and there should be no stuck place. 3. If the two gears do not match, the small gear will not be able to drive the large gear even if it rotates, so it will not rotate. 4. During installation, the pinion and large gear with the motor must be adjusted to a very good position (even if the shaft with the large gear moves left and right), it does not affect the fit of the two gears, that is the installation is OK.