*The large screen LCD shows that the parameters of charging and discharging can be adjusted.*Complete 3 stage PWM charging management.*Built-in over-current/short-circuit protection, open-circuit protection, reverse protection, are automatic recovery type, do not damage the controller.*Dual MOS anti-backflow, ultra-low calorific valueRecommendation:This controller is a 12V/24V lead-acid battery, which adapts automatically. When installing for the first time, please make sure that the battery has enough voltage so that the controller can recognize the correct battery type(the battery is not included in Inside)Install the controller as close to the battery as possible to avoid voltage drop caused by too long wires and affect the normal voltage judgmentThis controller is only suitable for various lead-acid batteries, please do not use other batteriesThis controller can only use photovoltaic panels as charging source, please do not use tributary or other power sources as charging sourceThe controller will heat up when running, please install the controller on a flat, well-ventilated surfaceSpecificationsUSB output 5V1AVoltage: 12V/24VPackage Include:1pc*Solar Panel Controller Note:Due to different personal measurement methods, there will be an error of 2-4 cm, please understandThanks for your support