Feature●Multi-volt Instant Start T8 Ballast will accept up to 2 or 1 F32T8 lamps●Accommodates multi-voltages from 120 to 277-volts, extra versatile for your unique projects●Anti-striation circuitry helps to eliminate and prevent the spiraling effect from lights●Active current regulation independently controls current output to each lamp●Mounting dimensions: 9-Inch L x 0.9-Inch W, Mounting slot set 0.3-Inch apartDescription Brand New Case of 10 GE Lighting 72266 GE232MAXP-N/ULTRA 120/277-Volt UltraMax Electronic Fluorescent T8 Multi-Volt Instant Start Ballast 2 or 1 F32T8 Lamps