All notices hereunder shall be sufficient upon receipt for all purposes hereunder if in writing and delivered personally, sent by documented overnight delivery service or, to the extent receipt is confirmed, telecopy or other electronic transmission service to the appropriate address or number (a) if to the Company, at the address set forth above, or (b) if to Purchaser, at the address set forth on the signature page hereof (or, in either case, to such other address as the party shall have furnished in writing in accordance with the provisions of this Section 5).