Optimate Duo Solar Charge ControllerOptiMate Solar does it differently: the solar panel is where the sun is and the smart pulse charger is where the battery is, so you have immediate information on battery condition at hand right where it matters mostConverts the low power from the solar panel to high current pulses for more effective charging and maintenance of a 12V battery14' of cable separates the charger from the panel, with SAE to SAE interconnection providing the option of extending furtherStandard battery clip set, weatherproof charge controller case and battery lead includedIdeal for EFB, STD, AGM and gel 12V batteries from 2Ah-240AhThe smart, 24-7 battery care solution powered by the sunCan withstand temperatures down to -4°FFor lead-acid and lithium batteriesLow-volt start of 1V