International Wireless Communication Expo Annual convention for two-way radio manufacturers. Held in Las Vegas, Nevada. Includes exhibitor list and registration information. http://www.iwceexpo.com

Halcom Communications Ltd. Provides mobile global communications equipment, satellite phones, worldwide paging, security monitoring, medical alarms, GRS radio, call centre and dispatch. http://www.halcom.ca

Empire Communications On the jobsite in San Rafael or in the Sonoma workplace, professional 2-way radios provide instant communication with individuals or multiple groups. They operate on exclusive business frequencies, which helps limit congestion. Some solutions require FCC license. http://www.empirecomm.net/

Vital Communications (Scotland) Ltd. Installation, service and hire of two-way mobile and handheld radio equipment as well as antenna installation and a consultation service. http://www.vitalcomms.com

I.D. Systems, Inc. Designs, develops and produces wireless monitoring and tracking system which uses radio frequency technology. (Nasdaq: IDSY). http://www.id-systems.com/