Unless otherwise provided, all notices and other communications required or permitted under this Warrant shall be in writing and shall be mailed by United States first-class mail, postage prepaid, sent by facsimile or delivered personally by hand or by a nationally recognized courier addressed to the party to be notified at the address or facsimile number indicated for such person in the Purchase Agreement, or at such other address or facsimile number as such party may designate by ten (10) days' advance written notice to the other parties hereto. All such notices and other written communications shall be effective on the date of mailing, confirmed facsimile transfer or delivery.