One side of the adapter board is SOP14 (1.27mm pitch) to DIP14 (2.54mm pitch), the other side is SSOP14 / TSSOP14 (0.65mm pitch) to DIP14 (2.54mm pitch). It is dual-side, unique design which can be compatible with more ICs.The 1x4P gold-plated pin header is durable, easy on the tin. After soldering the chip and pin header, the adapter board can be plugged directly into the breadboard to use, and it is easy to test.