The O-1 classification allows you to temporarily work in the U.S. in your field if you can demonstrate an extraordinary ability in the sciences, education, business, athletics, the arts, or in the motion picture or television industries. The O-2 classification is available to support staff accompanying the O-1 principal to assist with artistic or athletic events or performances. Spouses and dependent children of O-1 and O-2 principals are eligible for O-3 status in the United States and are ineligible to apply for work authorization. An O petition may be approved for up to three years, and extensions may be granted indefinitely for long-term projects or assignments or for a group of related performances or activities. There is currently no annual limit on O visa numbers.