Attached files

file filename
10-K - 10-K - EF Johnson Technologies, Inc.a2197725z10-k.htm
EX-32.2 - EX-32.2 - EF Johnson Technologies, Inc.a2197725zex-32_2.htm
EX-23.1 - EX-23.1 - EF Johnson Technologies, Inc.a2197725zex-23_1.htm
EX-31.2 - EX-31.2 - EF Johnson Technologies, Inc.a2197725zex-31_2.htm
EX-31.1 - EX-31.1 - EF Johnson Technologies, Inc.a2197725zex-31_1.htm
EX-32.1 - EX-32.1 - EF Johnson Technologies, Inc.a2197725zex-32_1.htm
EX-11.1 - EX-11.1 - EF Johnson Technologies, Inc.a2197725zex-11_1.htm

QuickLinks -- Click here to rapidly navigate through this document


Exhibit 21

Subsidiaries of the Registrant

        The following are the wholly-owned subsidiaries of the registrant, EF Johnson Technologies, Inc., a Delaware corporation:

Name of Subsidiary
  State or Jurisdiction of Incorporation or
Organization
E.F. Johnson Company   Minnesota
3eTechnologies International, Inc.    Maryland

*
Transcrypt International, Inc., a Delaware corporation and wholly-owned subsidiary of EF Johnson Technologies, Inc., merged into E.F. Johnson Company on April 1, 2009, and E.F. Johnson Company was the surviving company.



QuickLinks

Subsidiaries of the Registrant