The registered Holder of this Purchase Warrant agrees by his, her or its acceptance hereof, that such Holder will not: # sell, transfer, assign, pledge or hypothecate this Purchase Warrant for a period of one hundred eighty (180) days following the later of the Effective Date or the commencement of sales of the offering to which this Purchase Warrant relates (the later of such dates, the “Transferability Date”) to anyone other than: # Roth Capital Partners, LLC (“Roth”) or an underwriter or a selected dealer participating in the Offering, or # a bona fide officer or partner of Roth or of any such underwriter or selected dealer, in each case in accordance with FINRA Conduct Rule 5110(g)(1), or (b) cause this Purchase Warrant or the securities issuable hereunder to be the subject of any hedging, short sale, derivative, put or call transaction that would result in the effective economic disposition of this Purchase Warrant or the securities hereunder, except as provided for in FINRA Rule 5110(g)(2). On and after the Transferability Date, transfers to others may be made subject to compliance with or exemptions from applicable securities laws. In order to make any permitted assignment, the Holder must deliver to the Company the assignment form attached hereto duly executed and completed, together with the Purchase Warrant and payment of all transfer taxes, if any, payable in connection therewith. The Company shall within five (5) Business Days transfer this Purchase Warrant on the books of the Company and shall execute and deliver a new Purchase Warrant or Purchase Warrants of like tenor to the appropriate assignee(s) expressly evidencing the right to purchase the aggregate number of Shares purchasable hereunder or such portion of such number as shall be contemplated by any such assignment. The registered Holder of this Purchase Warrant agrees by his, her or its acceptance hereof, that such Holder will not sell, transfer, assign, pledge or hypothecate this Purchase Warrant.

The registered Holder of this Purchase Warrant agrees by his, her or its acceptance hereof, that such Holder will not: # sell, transfer, assign, pledge or hypothecate this Purchase Warrant for a period of one hundred eighty (180) days following the later of the Effective Date or the commencement of sales of the offering to which this Purchase Warrant relates (the later of such dates, the “Transferability Date”) to anyone other than: # Roth Capital Partners,THE REGISTERED HOLDER OF THIS PURCHASE WARRANT BY ITS ACCEPTANCE HEREOF, AGREES THAT IT WILL NOT SELL, TRANSFER OR ASSIGN THIS PURCHASE WARRANT EXCEPT AS HEREIN PROVIDED AND THE REGISTERED HOLDER OF THIS PURCHASE WARRANT AGREES THAT IT WILL NOT SELL, TRANSFER, ASSIGN, PLEDGE OR HYPOTHECATE THIS PURCHASE WARRANT FOR A PERIOD OF ONE HUNDRED EIGHTY DAYS FOLLOWING THE LATER OF THE EFFECTIVE DATE (AS DEFINED BELOW) OR THE COMMENCEMENT OF SALES OF THE OFFERING TO WHICH THIS PURCHASE WARRANT RELATES TO ANYONE OTHER THAN (I) ROTH CAPITAL PARTNERS, LLC (“Roth”) or an underwriter or a selected dealer participating in the Offering, or # a bona fide officer or partner of Roth or of any such underwriter or selected dealer, in each case in accordance with FINRA Conduct Rule 5110(g)(1), or (b) cause this Purchase Warrant or the securities issuable hereunder to be the subject of any hedging, short sale, derivative, put or call transaction that would result in the effective economic disposition of this Purchase Warrant or the securities hereunder, except as provided for in FINRA Rule 5110(g)(2). On and after the Transferability Date, transfers to others may be made subject to compliance with or exemptions from applicable securities laws. In order to make any permitted assignment, the Holder must deliver to the Company the assignment form attached hereto duly executed and completed, together with the Purchase Warrant and payment of all transfer taxes, if any, payable in connection therewith. The Company shall within five (5) Business Days transfer this Purchase Warrant on the books of the Company and shall execute and deliver a new Purchase Warrant or Purchase Warrants of like tenor to the appropriate assignee(s) expressly evidencing the right to purchase the aggregate number of Shares purchasable hereunder or such portion of such number as shall be contemplated by any such assignment. The registered Holder of this Purchase Warrant agrees by his, her or its acceptance hereof, that such Holder will not sell, transfer, assign, pledge or hypothecate this Purchase Warrant.OR AN UNDERWRITER OR A SELECTED DEALER IN CONNECTION WITH THE OFFERING, OR (II) A BONA FIDE OFFICER OR PARTNER OF ROTH CAPITAL PARTNERS, LLC OR OF ANY SUCH UNDERWRITER OR SELECTED DEALER.

The registered Holder of this Purchase Warrant agrees by his, her or its acceptance hereof, that such Holder will not: # sell, transfer, assign, pledge or hypothecate this Purchase Warrant for a period of one hundred eighty (180) days following the later of the Effective Date or the commencement of sales of the offering to which this Purchase Warrant relates (the later of such dates, the “Transferability Date”) to anyone other than: # Roth Capital Partners, LLC (“Roth”) or an underwriter or a selected dealer participating in the Offering, or # a bona fide officer or partner of Roth or of any such underwriter or selected dealer, in each case in accordance with FINRA Conduct Rule 5110(g)(1), or (b) cause this Purchase Warrant or the securities issuable hereunder to be the subject of any hedging, short sale, derivative, put or call transaction that would result in the effective economic disposition of this Purchase Warrant or the securities hereunder, except as provided for in FINRA Rule 5110(g)(2). On and after the Transferability Date, transfers to others may be made subjectTransferability. Subject to compliance with or exemptions fromany applicable securities laws. In order to make any permitted assignment,laws and the Holder must deliverconditions set forth in Section 5(d) herein and to the provisions of the Purchase Agreement, this Warrant and all rights hereunder (including, without limitation, any registration rights) are transferable, in whole or in part, upon surrender of this Warrant at the principal office of the Company or its designated agent, together with a written assignment of this Warrant substantially in the assignment form attached hereto duly executed by the Holder or its agent or attorney and completed, together withfunds sufficient to pay any transfer taxes payable upon the Purchase Warrant and paymentmaking of all transfer taxes,such transfer. Upon such surrender and, if any, payable in connection therewith. The Company shall within five (5) Business Days transfer this Purchase Warrant on the books ofrequired, such payment, the Company and shall execute and deliver a new Purchase Warrant or Purchase Warrants in the name of like tenorthe assignee or assignees, as applicable, and in the denomination or denominations specified in such instrument of assignment, and shall issue to the appropriate assignee(s) expresslyassignor a new Warrant evidencing the right to purchase the aggregate number of Shares purchasable hereunder or such portion of such number asthis Warrant not so assigned, and this Warrant shall promptly be contemplatedcancelled. Notwithstanding anything herein to the contrary, the Holder shall not be required to physically surrender this Warrant to the Company unless the Holder has assigned this Warrant in full, in which case, the Holder shall surrender this Warrant to the Company within three (3) Trading Days of the date the Holder delivers an assignment form to the Company assigning this Warrant full. The Warrant, if properly assigned, may be exercised by any such assignment. The registered Holdera new holder for the purchase of this Purchase Warrant agrees by his, her or its acceptance hereof, that such Holder will not sell, transfer, assign, pledge or hypothecate this Purchase Warrant.Shares without having a new Warrant issued.