RAE Systems (RAE)

Consent of Independent Registered Public Accounting Firm

RAE Systems Inc.

San Jose, California

We hereby consent to the incorporation by reference in the Registration Statements on Form S-3 (Nos. 333-113437 and 333-109840) and Form S-8 (Nos. 333-105368, 333-88684, 333-85720, and 333-32678) of RAE Systems Inc. of our reports dated March 24, 2006, relating to the consolidated financial statements of RAE Systems Inc. and the effectiveness of RAE Systems Inc.’s internal control over financial reporting, which appear in this Annual Report on Form 10-K.

/s/ BDO SEIDMAN, LLP

BDO Seidman, LLP

San Jose, California

March 30, 2006

Consent of Independent Registered Public Accounting Firm

RAE Systems Inc.

San Jose, California

We hereby consent to the incorporation by reference in the Registration Statements on Form S-3 (Nos. 333-113437 and 333-109840) and Form S-8 (Nos. 333-105368, 333-88684, 333-85720, and 333-32678) of RAE Systems Inc. of our reports dated June 6, 2005, relating to the consolidated financial statements of RAE Systems Inc. and the effectiveness of RAE Systems Inc.’s internal control over financial reporting, which appear in this Annual Report on Form 10-K/A No. 2. In our report on the effectiveness of internal control over financial reporting, we disclaim an opinion on management’s assessment and on the effectiveness of RAE Systems Inc.’s internal control over financial reporting.

CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

RAE Systems Inc.

Sunnyvale, California

We hereby consent to the incorporation by reference in the Registration Statements on Form S-3 (Nos. 333-113437; 333-109840) and Form S-8 (Nos. 333-105368; 333-88684; 333-85720; and 333-32678) of RAE Systems Inc. of our report dated May 2, 2005, relating to RAE Systems Inc. management’s assessment of the effectiveness of internal control over financial reporting, and the effectiveness of RAE Systems Inc.’s internal control over financial reporting, which appears in this Form 10-K/A. In our report, we disclaim an opinion on management’s assessment and on the effectiveness of the Company’s internal control over financial reporting.

Consent of Independent Registered Public Accounting Firm

RAE Systems Inc.

Sunnyvale, California

We hereby consent to the incorporation by reference in the Registration Statements on Form S-3 (Nos. 333-113437 and 333-109840) and Form S-8 (Nos. 333-105368, 333-88684, 333-85720, and 333-32678) of RAE Systems Inc. of our report dated March 16, 2005, relating to the consolidated financial statements of RAE Systems Inc., which appears in this Annual Report on Form 10-K.

/s/    BDO SEIDMAN, LLP

BDO Seidman, LLP

San Jose, California

March 16, 2005