N.H. Rev. Stat. Ann. § 281-A:4

Every employer subject to this chapter, or who elects to accept its provisions, shall keep posted in a conspicuous place upon the premises a notice that the employer is working under the provisions of RSA 281-A. If any employer fails to post such notice or to keep it posted, such employer shall be guilty of a violation for each day of such failure. This section shall not apply to employers who are subject to this chapter only because they employ domestics.