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 Controller Material: ABS System Voltage: 12 or 14V Panel Input Voltage: 55V Charging Current: 30A Discharge Current: 30A LVD: 11.0VAD 9V-12V x2 or 24V LVR: 12.6V AD 11V- 13.5V, x2 or 24V Floating Voltage: 13.8V ADJ11V-13V, x2 or 24V Boost Charging: 14.4V, x2 or 24V Voltage Is Less than 12V to Start Boost Charging for 2 Hours Battery Voltage Protection: 16.5V, x2 or 24V Overcurrent Protection: Yes, Restart Every Two Minutes Temperature Compensation: 24mV or C for 12V System, x2 or 24V Working Temperature: -20 to 55 Degree Celsius Waterproof Rating: IP32 USB: 5V 1.2A DC Output: 12 or 24V Size: 17.59cm x 13.9cm x 4.01cm or 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 Controller 1 x User Manual Note: 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.