Allows you to add a second unit to your dual battery setup. Will give you the extra juice you'll need to power electrical components like the BRP Audio-Premium System or Garmin Echomap Plus 62 cv Fish Finder for longer periods. Kit includes necessary wiring and battery holder. Additional battery sold separately (410301203). RXT, RXT-X, GTX and WAKE PRO (2018 and up) / FISH PRO (2019 and up)