The Iota ISD-420-EM-B self-diagnostic emergency backup battery provides emergency operation for 90 minutes. This emergency ballast will self-test for thirty seconds every month and for ninety minutes annually and will diagnose potential problems within the light fixture. It is compatible with most 10- to 57-watt 4-pin rapid start compacts including twin tube, triple tube, quad, 2D and straight. UL listed for damp locations and in enclosed and gasketed fixtures, this backup battery operates at 110/277-volt input, and features a test switch, charge indicator kit, and internal self-diagnostic circuitry. This ballast is not to be used with retrofit LED tubes.