1Fast Charging: Dual USB, type C all support fast charging protocol, make cell phone, power bank faster charging. 2Wiring Free Use: The DC5521 interface is directly connected to the controller, eliminating wiring hassles. 3Protection: Solar charge controller built in charging and discharging safety hours accumulation, battery reverse discharge, battery undervoltage, battery reverse connection, overload, short circuit protection. 4Universal: 12V, 24V acid batteries, lithium ion battery packs, lithium iron phosphate battery packs are universal and can be automatically recognized or manually adjusted. 5Photovoltaic Panel Drive Control: This product can use photovoltaic panels to drive the solar controller directly.