The CAN Bus Bluetooth Adapter for the ECUMaster EMU Black allows for wireless display of ECU parameters on an Android tablet or phone. This adapter is for use with the CAN version of the EMU (6 pins on the expansion port as opposed to 5 pins on the normal EMU), or with a standard EMU with the CAN expansion module or with the EMU Black. If you have an EMU Classic with the 5 pin expansion port, purchase the serial Bluetooth adapter instead. The Android app allows the customer to customize the style and size of the gauges, as well as deciding which parameters to display. Gone are the days of clumsy gauge pillars and dashboards littered with gauges, as all critical information can be displayed on one device quickly and easily. The Bluetooth adapter is an incredible value, especially when compared to buying gauges or a racing dash display.