Wireless Connection relay for extralights XBB - OBD Dongle, PowerUnit & Smart ButtonWireless Connection relay for extralights XBB The XBB OBD Dongle, PowerUnit, and Smart Button package provides a wireless and efficient solution for controlling auxiliary lighting in modern vehicles. Many newer cars with LED or Xenon headlamps use CAN bus technology, which prevents traditional relay wiring harnesses from being connected directly to the power cord of the bulb. The XBB system addresses this issue by intercepting the high beam signal