Features: Universal GPIO expansion board,compatible with raspberry Pi 2/3/4 Model B. High quality and high Printing process. Make your project more easier. Specifications: Material:plastic Type: Expansion Board Suit for: Raspberry Pi 2/3/4 Model B Communication connections: 1 TXD0 (broadcast) and 1 RXD0 (reception) Power connections: 5 of 3.3V, 2 of 5V and 5 of GND Pulse width modulation (PWM) connections: 2 GPIO connections: 11 PCM audio connections: 3 Connections with clock (CLK): 2 Peripheral serial bus interface (SPI) connections: 1 Input master / slave output connections (MISO): 1 Connections system validation chip (SCE): 2 I2C port connections: 8 (SDA, SCL, GOUI, EDAT, MOSI)