All notices under this Agreement shall be delivered by hand or by registered or certified mail. Notices intended for Executive shall be addressed to Executive at 4120 Specialty Place, Longmont, Colorado 80504. Notices intended for Employer shall be addressed to it at 4120 Specialty Place, Longmont, Colorado 80504. All notices shall be effective upon actual delivery if by hand, or, if by mail, three days after being deposited in the United States mail, postage prepaid and addressed as required by this Section 13. Either party may by notice accomplished in accordance with this Section 13 change the address to which future notices may be sent.