With this CAN Shield you can make contact with your Arduino with a CAN bus, for example from a car.
The shield uses the MCP2515 CAN Controller chip in combination with the MCP2551 CAN transceiver.

Specifications:

• SPI speed up to 10MHz
• CAN V2.0B with speeds up to 1Mb/s
• Standard (11 bit) or extended (29 bit) data
• Standard DB9 connector (see link below for pinout)
• Separate CAN-high and CAN-low output (blue terminal connector)
• LED indication for Power (PWR), TX, RX and Interrupt (INT)
• Switch to toggle between CAN bus voltage (“ON” mode) or Arduino voltage (“OFF” mode)
• Compatible with Arduino Uno, Mega and Leonardo
• Shield comes with separate headers that can be soldered.