Exhibit 10.1


June 1, 2004

Via Telecopier (651) 445-0217
Digital Angel Corporation
490 Villaume Avenue
South St. Paul MN  55075
Attention: James Santelli

        Re:  Letter Agreement

Dear Mr. Santelli:

         Reference  is  hereby  made to (i)  that  certain  Securities  Purchase
Agreement  dated July 31, 2003 by and between  Digital  Angel  Corporation  (the
"Company") and Laurus Master Fund, Ltd.  ("Laurus") (as amended,  the "July 2003
Agreement"),  (ii) the other Transaction  Documents referred to in the July 2003
Agreement,  (as amended, the "Related July 2003 Documents"),  (iii) that certain
Security  Agreement  dated August 28, 2003 by and between the Company and Laurus
(as amended,  the "August 2003  Agreement")  and (iv) the  Ancillary  Agreements
referred to in the August 2003 Agreement,  (as amended, the "Related August 2003
Documents")  (the July 2003  Agreement,  the Related  July 2003  Documents,  the
August 2003  Agreement  and the Related  August 2003  Documents,  as each may be
amended,  restated,   modified  and/or  supplemented  from  time  to  time,  the
"Documents").  Capitalized  terms  used but not  defined  herein  shall have the
meanings ascribed them in the July 2003 Agreement and the August 2003 Agreement,
respectively.

         This letter sets forth below Laurus'  understanding  of the  agreements
reached with the Company and its parent  corporation,  Applied Digital Solutions
Inc.  ("ADSX"),  as to certain  amendments and agreements  reached regarding the
Documents and related issues. Notwithstanding anything to the contrary contained
in the Documents,  Laurus hereby agrees,  and by the Company's  signature below,
the Company  hereby  agrees,  and, by  signature  below,  solely with respect to
paragraphs 3 and 5 below, ADSX hereby agrees, in each case, as follows:

         1.       The Company  shall not have the  ability  prior to maturity to
                  optionally  prepay in cash any outstanding  principal  amounts
                  evidenced by the Note (as defined in the July 2003  Agreement)
                  (the  "July  2003  Note") or any  Minimum  Borrowing  Note (as
                  defined in the August 2003 Agreement).

         2.       Laurus  hereby  agrees,  so long as the  initial  registration
                  statement  filed in connection  with the August 2003 Agreement
                  and the  Related  August  2003  Documents  (the  "August  2003
                  Agreement  Registration  Statement")  becomes  effective on or
                  prior  to 60 days  after  the  date  hereof,  any and all fees
                  alleged to be incurred by the Company and due to Laurus  prior
                  to the date of  effectiveness  of the  August  2003  Agreement
                  Registration  Statement  as a  result  of the  failure  of the
                  Company to timely cause the registration  statements  referred
                  to in the Documents  (including  certain  registration  rights
                  agreements)   to  be  filed  or  become   effective  with  the
                  Securities and Exchange Commission prior to the dates required
                  by such Documents shall, in each case, be waived.




3.       Within two (2) business days after the date hereof Laurus hereby agrees
         to convert (such conversion, the "Initial Conversion") a portion of the
         July 2003 Note equal to 150,000 shares of the Company's common stock at
         the fixed  conversion  price applicable to said Note and as promptly as
         practicable  following such conversion,  ADSX hereby agrees to purchase
         such  shares of the  Company's  common  stock from Laurus at a purchase
         price  equal to the  Volume  Weighted  Average  Price ("  VWAP") of the
         Company's  common  stock  for the three (3)  trading  days  immediately
         preceding the Initial Conversion.

4.       Laurus hereby agrees that its conversions of the outstanding  principal
         amount of the July 2003 Note,  any Minimum  Borrowing Note or any other
         outstanding  note or other  obligation  issued by the Company to Laurus
         will not  exceed  twenty-five  percent  (25%) of the  aggregate  dollar
         trading  volume of the  Company's  common stock for the thirty (30) day
         trading period  immediately  preceding a delivery by Laurus of a notice
         of conversion to the Company.

5.       Laurus hereby agrees that with respect to each  conversion by Laurus of
         an outstanding amount of the July 2003 Note or a Minimum Borrowing Note
         into the Company's common stock occurring after the Initial Conversion,
         the  Company  and ADSX  shall  have the right to  purchase  all of such
         common stock converted by Laurus at a price per share equal to the VWAP
         of  the  Company's   common  stock  for  the  three  (3)  trading  days
         immediately preceding such conversion, which right shall terminate (the
         "Termination Time") at the end of the third (3rd) business hour (with a
         "business  hour"  consisting  of any hour between 9 a.m. and 5 p.m. New
         York time)  following  provision  by Laurus to the  Company and ADSX of
         written or email  notification of such conversion (it being  understood
         that the Company and ADSX shall, at the time of any such  notification,
         determine  among  themselves  the manner in which such  purchase  right
         shall be  allocated  between the Company and ADSX).  Notice of any such
         conversion  shall be made in the manner  provided for in the Documents,
         but in  addition,  Laurus  agrees to telecopy  and email a copy of each
         such notice of conversion to:

           Mr. Kevin McGrath, kmcgrath@digitalangelcorp.com, 651-805-8001
           Mr. James P. Santelli, jsantelli@digitalangelcorp.com, 651-455-0217
           Mr. Philip Colton, pcolton@winthrop.com, 612-604-6929
           Mr. Scott   Silverman,   ssilverman@adsx.com, 561-805-8001
           Mr. Michael Krawitz, mkrawitz@adsx.com, 561-805-8001

         In the event that the Company  and/or ADSX has not  informed  Laurus in
         writing of its exercise of its right to purchase such converted  common
         stock of the Company prior to the respective  Termination  Time, Laurus
         shall be permitted to transfer the shares of the Company's common stock
         referred to in this paragraph 5 in any manner which it so chooses.

6.       Laurus  hereby agrees that it will not convert into common stock of the
         Company any amount  outstanding  under the August 2003 Agreement or the
         Related August 2003 Documents prior to the repayment in full (either in
         cash or by way of  conversion  into common stock of the Company) of all
         obligations  outstanding  under the July 2003 Agreement and the Related
         July 2003 Documents.





This letter shall be governed by, and construed in accordance  with, the laws of
the State of New York.



                                        LAURUS MASTER FUND, LTD.

                                        By: /s/ David Grin
                                            ---------------------------------
                                            David Grin
                                            Director

Agreed and accepted on the date hereof:

DIGITAL ANGEL CORPORATION

By: /s/ James P. Santelli
    -----------------------------------------
    Name: James P. Santelli
    Its Chief Financial Officer

APPLIED DIGITAL SOLUTIONS INC.

By: /s/ Evan C. McKeown
    -----------------------------------------
    Name: Evan C. McKeown
    Title: Chief Financial Officer