(a) In general Each employer shall post and keep posted, in conspicuous places on the premises of the employer where notices to employees and applicants for employment are customarily posted, a notice, to be prepared or approved by the Secretary, setting forth excerpts from, or summaries of, the pertinent provisions of this subchapter and information pertaining to the filing of a charge. (b) Penalty Any employer that willfully violates this section may be assessed a civil money penalty not to exceed $100 for each separate offense.