DEK1188 Features: * Ballast * Operates one ore two of the existing lamps for minimum of 90 minutes * Can be mounted in the fixture wire way or on top of the fixture * Each emergency ballast contains battery, charger and invertors circuit in single package * Suitable for factory installation or retrofit applications * Certified for UL Listed Dimensions: * Overall dimensions: 2.4"" H x 9.4"" W