Features:1. Full 3-stage PWM charge management. 2. Dual USB output, 5V output voltage, support most of electronic equipments charging. 3. Built-in industrial micro controller, with power off memory function. 4. Intuitive LCD display shows working status of the controller to users. 5. Double key operation, easy to adjust charge/discharge parameters. 6. Built-in short-circuit protection, open-circuit protection, reverse connection protection, overload protection. Specification:Batt voltage12V/24V auto Charge current 20A Discharge current 10A Max solar input 23V Overvoltage protection 16.5V Equalization 14.4V Float charge 13.8V (default, adjustable) Discharge stop 11.0V (default, adjustable) Discharge reconnect 12.6V (default, adjustable) Charge reconnect 13V Voltage of open light Solar panel 8V (Light on delay) Voltage of close lightSolar panel 8V (Light off delay)Terminal scale 28-10 AWG Self-consume <12 mA USB output 5V/2A Operating temperature -35~60 Size 130*42*91mm / 5.1*1.7*3.6in Weight Approx. 323g / 11.4oz Tips: All red voltage is only for 12V system, please double it while using 24V system. Package list:1 * Solar Charge Controller 1 * User ManualNote:1. The regulator is only suitable for lead-acid batteries: OPEN, AGM, GEL. Not suitable for NiMH, Li-ion or other batteries. 2. Make sure your battery has enough voltage for the controller to recognize the battery type before first installation. 3. The battery cable should be as short as possible to minimize loss. 4. The charge controller is only suitable for regulating solar modules. Never connect another charging source to it. .