This is a 100 watt electronic tanning bed lamp ballast. The ballast controls 2 100 watt lamps (110V use) or can control 1 - 100W lamp (220V use). It comes wired for 2 100W lamps.
This ballast comes built for 110V use but if you snip the J2 wire in half (break the connection) it will work for 220V.
This item was often used in older Sunquest tanning beds that run off of 110 volts. The newer Sunquest tanning beds most likely will not have this ballast.