2. Assemble circuit boards and accessories

2.1 Install the battery box and fix the hexagonal copper column above the wooden board with two M3 * 8 screws.

2.2 Use two M3 * 6 screws to fix the battery box on the hexagonal copper post.

2.3 Use two M3 * 8 screws on the other side to fix the hexagonal copper column under the wooden board.

2.4 Use two M3 * 6 screws to fix the circuit board on the hexagonal copper post.

2.5 Use M3 * 8 screws and nuts to fix the antenna in the lower right corner or elsewhere, taking care not to tear the antenna.