Features: This solar charging controllers is suitable for both 12V and 24V power systems. Double USB port allow for easy and convenient charging of your devices. Monitors the charging condition and voltages on the LCD display for improved control. Equipped with necessary protections devices, the control parameters of systems is adjustable, easy to set up and operate. Builted in overheating, overcurrent, short circuits, open circuits protections, fault elimination, controllers automatic recovery. Specifications: Component: Plastic Size: about 12.5x11.2x3.4cm/4.92x4.41x1.34inch Current Option: 10amp/20A/30amp systems voltages: 12V/24V automatic adaptation discharge current: 10amp maximums photovoltaic voltages: 23V for 12V battery; 46V for 24V battery Increase charging voltages: 14.4V Floating charging voltages: 13.7V (default value, adjustable) Discharge cut-off voltages: 10.7V (default value, adjustable) Discharge recovery voltages: 12.6V (default value, adjustable) Charging recovery voltages: 13V Light controlled turning on threshold: 8V for photovoltaic panels (with delay for light controlled turning on) Light controlled turning off threshold: 8V for photovoltaic panels (light controlled turning off has a delay) USB output: 2 USB outputs, 5V/2.5A (maximums) Standby current:<10mA Working temperature: -35~+60 ℃ Package Includes: 1pc Solar charging Controllers note: Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. Due to the difference between different monitors, the picture may not reflect the actual color of the item.