Gemini is Ireland’s leading retail security company, based in County Derry, Northern Ireland.
Established in 2004 by Ronan McCullagh, GR Security boasts over fifteen years of expert industry experience.
After learning the trade in England, Ronan returned home to Derry and immediately began offering high quality service in retail security. GR Security has installed and maintained security systems for well-known companies such as Sainsbury’s, Topshop, and Pepe Jeans.

At GR Security, we’re in the business of keeping your goods where they belong – on the shelf, or with a paying customer.

Our extensive knowledge of security products and systems, from CCTV to electronic tagging, is guaranteed to protect your sales and profits. We offer unparalleled experience of installing and maintaining security systems, and we tailor our process to your exact needs to ensure a cost-effective and worthwhile service.

From the first phone call and installation, and throughout the lifetime of your system, our mission is defined by three core aims:

Customer Satisfaction
Value for Money
Prompt Service