A sensor device for conducting electronic transactions from a vehicle including a housing including an RFID circuit operably connected to an RFID antenna, a short range communication device, the RFID circuit and short range communication device operably connected to a processor, and a power supply. The sensor device is wirelessly connectable to a mobile communication device via the Bluetooth chip and the mobile communication device runs a software application. The RFID antenna is adapted to receive a wireless signal from a transmitter. Responsive to the wireless signal, the processor causes the short range communication device to wirelessly communicate with the mobile communication device to initiate a transaction.