This is a T-type breakout kit used for extending the GPIO interface on Raspberry Pi to breadboard. It helps you to make the connections between Raspberry Pi and breadboard become simple. The kit comes with a 26 pin ribbon cable and an adapter board. Compatible with both Raspberry Pi revision A and revision B. Notice: this breakout kit doesn't include breadboard. Corresponding Interface P0 - GPIO 17 P1 - GPIO 18 P2 - R1: GPIO 21, R2: GPIO 27 P3 - GPIO 22 P4 - GPIO 23 P5 - GPIO 24 P6 - GPIO 25 P7 - GPIO 4 CE1 - GPIO 7 CE0 - GPIO 8 SCLK - GPIO 11 MISO - GPIO 9 MOSI - GPIO 10 RXD - GPIO 15 TXD - GPIO 14 SCL - R1: GPIO 1, R2: GPIO 3 SDA - R1: GPIO 0, R2: GPIO 2