On one or more Closing Dates, upon the terms and subject to the conditions set forth herein, substantially concurrent with the execution and delivery of this Agreement by the parties hereto, the Company agrees to sell, and the Purchasers, severally and not jointly, agree to purchase, up to an aggregate of $600,000 of Units; provided, however, upon the written consent of the Company, such amount may be increased. Each Purchaser shall deliver to the Company, via wire transfer or a certified check drawn on a United States bank, immediately available funds equal to such Purchaser’s Subscription Amount as set forth on the signature page hereto executed by such Purchaser, and the Company shall deliver to each Purchaser its respective shares of Series A-1 Preferred Stock and Series A-1 Warrants, as determined pursuant to Section 2.2(a), and the Company and each Purchaser shall deliver the other items set forth in Section 2.2 deliverable at the Closing. Upon satisfaction of the covenants and conditions set forth in Sections 2.2 and 2.3, each Closing shall occur at the offices of Company Counsel at 1750 Tysons Boulevard, Suite 1000, McLean, Virginia 22102 or such other location as the parties shall mutually agree. There shall be no minimum investment amount necessary to effect a Closing.