Wireless Connection relay for extralights XBB - OBD Dongle & PowerUnitWireless Connection relay for extralights XBB OBD Dongle & PowerUnit The XBB OBD Dongle & PowerUnit is an advanced relay and driver combination that wirelessly detects signals from a vehicles CAN bus. In many modern cars with LED or Xenon headlamps, traditional relay wiring harnesses cannot be connected directly to the power cord of the bulb, as is possible with halogen lighting. This device provides an effective solution by intercepting the high beam