Standard for 40PIN GPIO extension header, supports for series boards CAN function, onboard CAN controller MCP2515 via SPI interface, onboard transceiver SN65HVD230 RS485 function, controlled via UART, half-duplex communication, supports automatic TX/RX control without programming, onboard transceiver SP3485 Onboard (Transient Voltage Suppressor), effectively suppress surge voltage and transient spike voltage in the circuit for RS485 transceiving, anti-electrostatic Reserved control pins, allows to work with other control boards Operating voltage: 3.3V CAN controller: MCP2515 CAN transceiver: SN65HVD230 485 transceiver: SP3485 Dimension: 65mm x 30mm Material:plastic colour:blue Package Contents: 2 x Module HAT Expansion Board Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.