This is ALEKOŽ Solar Photovoltaic Controller. This solar controller is waterproof and can be used for 12V or 24V solar power generation system and solar street lights, or other small solar application gadgets. When using all solar controllers, the first step is to connect with the battery and the second step is to connect with the solar panel. The solar controller function is to manage the charge and discharge process in the solar power generation system. Meanwhile, it can turn the load on and off. The LED digital tube is used to display battery capacity, as well as charging and setting information.