1,POWER OFF MEMORY: Automatic identification of 12V 24V system voltage, there are a series of parameter settings and power off save function, so that no need to repeat settings. Using temperature compensation, charging parameters can be automatically adjusted 2,LONG BATTERY LIFE: Using the upgraded 3 level P charging algorithm to equalize the battery regularly or when over discharging, can effectively prevent non equalization and vulcanization of battery, thus prolonging the service life of battery 3,SUPPORT LOAD START: A variety of load operation modes are available, which is convenient for the product to be applied to different types of loads. With the advanced load start method, large capacitive loads can be started smoothly. With industrial grade design, the product can work well under various harsh conditions run 4,MULTIPLE PROTECTIONS: Solar charge controller provides overcharge, overdischarge, overload protection, as well as short circuit protection, TVS thunder protection 5,SIMPLE OPERATION: The controller provides a dot matrix graphic LCD screen and a human machine interface with 2 buttons. The user friendly design of the browser and dynamic interface ensures the convenience and intuitiveness of operation 6,OPTIONAL COMMUNICATION FUNCTION: Providing an RJ12 data port, output TT1232 level or Bluetooth signal, the data adopts standard hobu protocol, can be used with the host computer monitoring software or mobile phone APP 1 x Solar Charge controller1 x User Manual Item Type: Solar Charge ControllerMaterial: ABSCurrent: 20AVoltage: 12 24V automaticSolar Input Voltage: Less than 55VUSB Output: 5V1AOperating Temperature: -25℃ to 55℃Protection Class: IP30 Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.