ALL ARE USED AND UNTESTED. WHAT YOU SEE IS WHAT YOU GET. This is a top-of-the-line Advance Transformer Ballast, model RM-2S40-TP. It's designed for use with 34W, 35W or 40W fluorescent standard light sources and can operate at 120 volts and 60 Hertz. Made in the United States, this ballast is a reliable choice for your lighting needs. The black color adds a sleek touch, and with its compatibility with any bulb color, you have more options at your disposal. Ideal for industrial and safety facilities, this Ballast will keep your lighting system running smoothly.