Features: 1High Charging Efficiency: Improve the charging current compared with the traditional PWM controller MPPT charging efficiency can be improved by 10 to 30%. (Controller conversion efficiency >95%) 2Dual Battery Charging: Two groups of batteries can be connected at the same time according to the priority set by the user to charge the battery can maximize the use of solar energy. 3With Bluetooth Function: External Bluetooth module can be connected and controller parameters can be displayed through mobile APP (Bluetooth adapter needs to be purchased separately). Bluetooth effective distance is 10 meters. 4Overcharge Protection: When the battery is full the charging current will be reduced and when the battery is out of power it will immediately charge the battery. 5Multiple Applications: 5 kinds of batteries can be selected by dip switch GEL battery AGM battery lithium iron phosphate battery and lithium ternary battery. Specification: Item Type: Solar Charge ControllerMaterial: Aluminum alloyWeight: Approx. 903g/31.9ozBattery Connection Terminal: M8 screwsOperating Temperature: -20 to +50 Package List: 1 xSolar Charge Controller1 x English Specification Note: Before connecting the battery to the controller install a fuse in the positive terminal. The fuse size is 1.5 to 2 times the rated charging current.