Item Type: Solar Charge Controller Board Material: Fiberglass Model: 3237 Application: Solar energy single and double side lights, flash lights, landscape lights, Christmas lights charging, photosensitive control and flash light control. Circuit Board: Compatible with 3.7V lithium battery, 3.2V lithium iron phosphate battery, 6V12V battery. Maximum Charge Current: 3A Maximum Discharge Current: 1A Different Battery Types Identify Voltage Ranges: The identification range of 3.2V single section of lithium iron is 2.5-4V The identification range of 3.7V single section lithium battery is 3-4.4V The identification range for 6V batteries is 5-7.5V The identification range for 12V batteries is 9-15V 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.