Specifications:It has built-in industrial microcontroller and dual USB charging ports.The controller has one-key setting, LCD digital display, automatic memory function.It also has built-in short circuit protection, open circuit protection, reverse protection, overload protection. Item Name: Solar Charge ControllerMaterial: ABSSystem Voltage: 12V/24V AdaptiveRated Charging Current: 20-60ARated Discharge Current: 20-60AHighest Photovoltaic Voltage: Floating Voltage: 13.7V (Default Value, Adjustable)Discharge Cut-off Voltage: 10.7V (Default Value, Adjustable)Discharge Recovery Voltage: 12.6V (Default Value, Adjustable)USB Output: 5V/3AStandby Current: Working Temperature: -35 to 60 Degree Celsius20A - 30A Size: 13.5cm x 7cm x 3.2cm/5.31" x 2.76" x 1.26" (Approx.)40A - 60A Size: 18.5cm x 9cm x 4cm/7.28" x 3.54" x 1.57" (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