An 8 pin M12 cable that connects the RS485 communication port on a SMART4/5 Roamer battery to another one. In this way, you can link up to 16 batteries together. Add this to your cart if you have multiple Roamer SMART batteries and will be connecting your battery bank to a Victron GX device, or other CANbus based display screen. Comes in 1m, 2m and 3m variants to ensure any battery bank configuration can be accommodated.