Features: This solar charge controllers is suitable for both 12V and 24V power systems. Have a large LCD display and fully adjustable parameters for precise monitoring of your solar systems. With 4 builted in USB port (maximums 2A), you can charge mobile phones and other electronic devices directly from the controller. Builted in short circuits, open circuits, reverse, and overloads protections to for ensure safe use. Suitable for solar generation systems, widely used in outdoor camping, travel, home backups power management. Specifications: Component: ABS, Aluminum Base Plate Size: about 185x95mm/7.28x3.74inch Charge current：30A Maximums solar input:12V battery, the highest 23V; 24V battery when the highest 46V Package Includes: 1pc Solar Charge Controllers note: Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. Due to difference between different monitors, the picture may not reflect the actual color.