CREATE TABLE table_42409 ("City of license" CLOB, "Identifier" CLOB, "Frequency" CLOB, "Power" CLOB, "Class" CLOB, "RECNet" CLOB)

What is Class, when Power is 78 Watts?
SELECT "Class" FROM table_42409 WHERE "Power" = '78 watts'
SELECT "Class" FROM "table_42409" WHERE "Power" = '78 watts'