The Coralife 2-Lamp Electronic Ballast is completely assembled and ready to install. Simply connect the lamps and plug in the unit. The 2-Lamp Electronic Ballast features Coralifes energy efficient electronic ballast that uses 35% less energy than conventional magnetic ballasts. It is manufactured using rugged Coralife Water Resistant Endcaps with 9 ft. leads. It also has an 8 ft. power cord for easy installation. The unit has a positive on/off switch with indicator light. It is available with T12 (1 1/2") endcaps. For all 24" (20 watt), 36" (30 watt) and 48" (40 watt) lamps.