1Multiple Protection: The solar charge controller is equipped with built in charging and discharging safety hour accumulation, battery reverse discharge, battery undervoltage, battery reverse connection, overload, and short circuit protection. 2Scope of Application: The solar panel charge controller is universal for 12V/24V lithium ion battery packs, and lithium iron phosphate battery packs, and can be automatically recognized or manually adjusted. 3Fast Charging: Both dual USB and Type C support fast charging protocols, allowing phones and power banks to charge faster. 4DC5521 Interface: The DC5521 interface is directly connected to the controller, eliminating wiring difficulties. 5Photovoltaic Panels to Drive Solar Controller: This product can use photovoltaic panels to directly drive the solar controller.