Specially Designed to use with XUNZEL PV Solar Panels. Charge and Discharge Controller with USB Output and ON/OFF Push Button. USB output to charge electronic devices. Charging method designed for Lead Acid AGM / GEL and Flooded batteries. Fully electronically protected. Programmable Operation Mode: System Mode (manual output on/o?) or D2D Mode (Dusk-to-Dawn). Easy-to-read Display. 5 LEDs to indicate system status.