Control Freq Ltd is a London based, online supplier of GSM control, communication, monitoring and detection systems. The company’s main products are GSM intercoms, GSM alarm diallers, GSM lift emergency phones & PSTN line retrofit to GSM, GSM remote & access control systems & GSM monitoring products and software.

TEW Plus is a leading independent telecommunications and security systems integrator serving the transport and commercial sectors. Formed in 2006 from a range of rail professionals, to provide valued, dedicated services to the rail sector. TEW Plus offer a full installation service including; design, project management, survey, installation, commissioning and enabling works through to maintenance.