Note: The color of the product we ship is the color in the first picture, and the specification and quantity are shipped according to the quantity and specification described in the title. If you need to change the color or style, you need to contact us within 12 hours after placing the order. Our product description: RC Helicopter DIY Building Blocks Drone 2.4G 4CH Mini 3D Bricks Quadcopter Assembling Educational Toys|RC Helicopters Special Note Note: Do not pull the line when assembling You can't hold the hand to change the fan blade, you need to put it on a flat surface for operation The installation sequence of the quadcopter: the red and blue lines are installed diagonally, and the black and white lines are also diagonally installed As shown in the figure: A is a red and blue wire motor, and B is a black and white wire motor. Special improvement: Motors of the same color must be installed on the same horizontal line Product Size: 16*15.5*3.8CM (Expanded Size) Color box size: 29*16*7.5CM Product net weight: 52g Package Weight: 325g Charging time: about 45 minutes Sailing time: about 5-7 minutes Remote control distance: 50-80m Remote control use: AA battery*3 (need to bring) Body battery: 3.7V 400 mAh Maximum flying height: 120 meters and below Aircraft type: Four-axis aircraft Applicable age: 14 years old and above The aircraft is compatible with a series of similar blocks such as LG DIY can be added to the assembly plate or install the villain Note: Because the model and display effect of the monitor may be different, there may be slight differences in color, and the size is manually measured, there may be an error of 1-2cm, please understand.