Specification: LCD remote monitor The external display can display the voltage of two groups of batteries, solar panel voltage, charging current, charging energy WH, charging ampere hour AH, battery temperature, battery priority order in real time. Please refer to the display manual for specific instructions. Bluetooth dongle With an external Bluetooth adapter, the controller is connected to the mobile phone APP through Bluetooth, and the charging parameters are sent to the mobile phone. The customer can view the controller's parameters (effective distance 10 meters), including battery voltage, solar panel voltage, charging current, charging WH, charging AH, and history records and fault prompts APP includes Android version and Apple version, free to use For specific instructions, please refer to the Bluetooth adapter manual SEARCH "CHARGERCONNECT" ON app store. CONTENTS IN BOX MPPT 30A DUAL CONTROLLER REMOTE LCD METER BLUETOOTH DONGLE. Note: Photo color might be a little different from the actual product due to color display of different monitors. Packing Included: 1 x Solar Charge Controller