2299001604 Schumacher Control Board PSJ-1812. Controls charging and display status of unit. Works great as a stand alone AGM battery charger as well. just add a 16 volt 500ma power supply (Yellow Leads). Battery Leads (Black - Red), Status Switch leads (Blue)
Warning: This product may expose you to chemicals including lead which are 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