1MAIN PURPOSE: Helps you automatically manage solar panel and battery operation with built in industrial microcontroller, compatible with 12V 24V system voltage. 2DUAL USB OUTPUT: 3 levels PWM charging management with dual USB interface outputs, 5V/5A (maximum), which can charge mobile phones, tablets, PCs. 3CIRCUIT PROTECTION: With overcurrent, short circuit, reverse connection, low voltage and overcharge protection, safe operation and extended battery life. 43 LEVEL PWM CHARGING: Adopt fast charging, large charging and floating charging 3 phase PWM adjustment charging, to achieve efficient and intelligent charging. 5WIDE APPLICATION: Suitable for solar power generation systems, smart homes, solar ventilation systems, solar light boxes, billboards and warning lights, etc.