Double Sided PCB Board: 10* 2x8cm + 10* 3x7cm + 5* 4x6cm + 3* 5x7cm + 2* 7x9cm; the minimum size is 2cm, the maximum size is 9cm, which can meet the practice needs of connecting fewer or more components, using a large-size PCB board, the finished product is more complete.
40Pin Header Connector: 10* male + 10* right angle male + 10* female; pitch: 2.54mm; connect the front and back electrical appliances more flexibly.