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Optional Power Supplies may be substituted: Model S1460 -International AC Adapter/Recharger (110/220V, 50/60Hz). Model S1462 - 12 Volt DC adapter (automotive cigarette lighter plug-in). Model S1465 - NiCad Battery Pack. TO INSTALL OR REPLACE BATTERIES Remove Reading board. Loosen two wing nuts on battery holder bracket. Remove battery holder from amplifier. Insert (10) new Alkaline “D” cell batteries, be sure to observe polarity, or replace with Model S1465 NiCad battery pack. Carefully replac