Rae Systems Inc Watch

from SC 13D/A 1 page Exhibit 1 Joint Filing Agreement the Undersigned Agree That the Statement on Schedule 13d/a Dated February 3, 2004 With Respect to the Common Stock of Rae Systems Inc. Is, and Any Amendments Hereto Signed by Each the Undersigned Shall Be, Filed on Behalf of Each of US Pursuant to and in Accordance With the Provisions of Rule 13(d) Under the Securities Exchange Act of 1934, as Amended. Dated February 3, 2004 By: /S/ Robert I. Chen Robert I. Chen Chairman and Chief Executive Officer of Rae Systems Inc. Robert I. Chen 2001 Annuity Trust Uta Dated December 19, 2001 By: /S/ Robert I. Chen Robert I. Chen Trustee By: /S/ Lien Q.C. Chen Lien Q.C. Chen Lien Q.C. Chen 2001 Annuity Trust Uta Dated December 19, 2001 By: /S/ Lien Q.C. Chen Lien Q.C. Chen Trustee

from 8-K 35 pages Rae Systems Inc. 8,800,000 Shares Common Stock Underwriting Agreement

from SC 13D ~5 pages Underwriting agreement

from SC 13D 1 page <page> Exhibit 1 Joint Filing Agreement the Undersigned Agree That the Statement on Schedule 13d Dated April 19, 2002 With Respect to the Common Stock of Rae Systems Inc. Is, and Any Amendments Hereto Signed by Each the Undersigned Shall Be, Filed on Behalf of Each of US Pursuant to and in Accordance With the Provisions of Rule 13(d) Under the Securities Exchange Act of 1934, as Amended. Dated April 19, 2002 By: /S/ Robert I. Chen Robert I. Chen Chairman and Chief Executive Officer of Rae Systems Inc. Robert I. Chen 2001 Annuity Trust Uta Dated December 19, 2001 By: /S/ Robert I. Chen Robert I. Chen Trustee By: /S/ Lien Q.C. Chen Lien Q.C. Chen Lien Q.C. Chen 2001 Annuity Trust Uta Dated December 19, 2001 By: /S/ Lien Q.C. Chen Lien Q.C. Chen Trustee