Specifications:The function of the controller is to protect voltage overshoot and overplay.The controller has LCD digital display, USB port.It also has built-in short circuit protection, open circuit protection, reverse protection, overload protection.Item Name: Solar Charge ControllerMaterial: ABSSystem Voltage: 12/14VPanel Input Voltage: 55VCharging Current: 30ADischarge Current: 30ALVD: 11.0VAD 9V-12V x2/24VLVR: 12.6V AD 11V--13.5V, x2/24VFloating Voltage: 13.8V ADJ11V-13V, x2/24VBoost Charging: 14.4V, x2/24V Voltage Is Less than 12V to Start Boost Charging for 2 HoursBattery Voltage Protection: 16.5V, x2/24VOvercurrent Protection: Yes, Restart Every Two MinutesTemperature Compensation: 24mV/C for 12V System, x2/24VWorking Temperature: -20 to 55 Degree CelsiusWaterproof Rating: IP32USB: 5V 1.2ADC Output: 12/24VSize: 17.59cm x 13.9cm x 4.01cm/6.93" x 5.47" x 1.58" (Approx.)Notes:Due to the light and screen setting difference, the item’s color may be slightly different from the pictures.Please allow slight dimension difference due to different manual measurement.Package Includes:1 x Solar Charge Controller1 x User Manual