All notices, demands requests, consents, approvals, and other communications required or permitted hereunder shall be in writing and, unless otherwise specified herein, shall be (i) personally served, (ii) deposited in the mail, registered or certified, return receipt requested, postage prepaid, (iii) delivered by reputable air courier service with charges prepaid, or (iv) transmitted by hand delivery, telegram, facsimile or electronic mail, addressed as set forth below or to such other address as such party shall have specified most recently by written notice. Any notice or other communication required or permitted to be given hereunder shall be deemed effective (a) upon hand delivery or delivery by facsimile or electronic mail, with delivery receipt or the affidavit of messenger, at the address, number or electronic mail address designated below (if delivered on a Business Day during normal business hours where such notice is to be received), or the first Business Day following such delivery (if delivered other than on a Business Day during normal business hours where such notice is to be received) or (b) on the second business day following the date of mailing by express courier service, fully prepaid, addressed to such address, or upon actual receipt of such mailing, whichever shall occur first. The addresses for such communications shall be: (i) if to the Company, to: Surna Inc., Attn: Chief Executive Officer - Amendment, Surna 1780 55 th Street, Suite C, Boulder, Colorado 80301, facsimile: +1 (303) 955-2544, e-mail: amendment@surna.com, with a copy (which shall not constitute notice) to Duane Morris LLP, Attn: David N. Feldman, 1540 Broadway, New York, New York 10024, facsimile: +1 (212) 202 6094, e-mail: dnfeldman@duanemorris.com, and (iii) if to the Note Holder, to the address, fax number and e-mail as indicated on the signature page attached hereto.