Features: This solar charge controllers is suitable for both 12V and 24V power system. Have advanced Maximums power points tracking technology. It continuously track the Maximums power of the array to obtain Maximums power to charge the battery. Monitors the charging status and voltages on the LCD display for improved control. Equipped with necessary protections devices, the control parameters of system is adjustable, easy to set up and operate. Builted in overheating, overcurrent, short circuits, open circuits protections, controllers automatic recovery. Specifications: MaterialS: Aluminum Current: 10/20A (optional) Size: about 16x9.8x4.26cm/6.30x3.86x1.68inch System voltages: 12/24V automatic Maximums Solar Panel input voltages: 50V Maximums load current: 20A 10Amp Maximums Solar Panel input power: 120W/12V, 240W/24V 20A Maximums Solar Panel input power: 240W/12V, 480W/24V Package Includes: 1pc Solar Charge Controller 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.