BYD LV Battery Management Unit (BMU) is applicable for the BYD Battery-Box Premium LV systems (LVS 4.0 - 24.0 and LVL 15.4), and works as a control unit for the systems.BMU is equipped with a WLAN interface as a standard. The APP - Be Connect - could communicate with BMU through the WLAN.The connection between BMU and Battery-Box should be the Straight-Through Wired Cable (CAT 5 shield or above, not longer than 10m).Detailed connection instructions with inverters could be read in the Battery-Box LVS/LVL Quick Start Guide.