Safely control your energy source and protect batteries from being overcharged. The solar charge controller is designed to protect your 12 volt GEL or Flooded battery from being overcharged by solar panels. It also provides protection from reverse battery connection. This controller will display charging current or battery voltage from the LCD meter. WARNING: This product can expose you to chemicals including LEAD, which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information, go to www.P65Warnings.ca.gov.