EXHIBIT 21.1

Subsidiaries of the Registrant

RAE Systems Inc, a California corporation

RAE Systems (Asia) Limited, incorporated in Hong Kong

RAE Systems (Hong Kong) Limited, incorporated in Hong Kong

RAE Systems Europe ApS, incorporated in Denmark

RAE United Kingdom Limited, incorporated in the United Kingdom

S.A.R.L RAE France, incorporated in France

RAE Systems (Shanghai) Incorporated, incorporated in the Jiading District of Shanghai

RAE-KLH (Beijing) Co., Limited, incorporated in Beijing

RAE Coal Mine Safety Instrument (Fushun) Co., Limited, incorporated in Fushun, China