Crosby Intruder Alarms offer full design, installation, service, repair and maintenance to hardwired alarm systems, CCTV, access control, security lighting, fire alarms, local area paging, caravan park security, and door entry systems.

Cruatech specialises in building integration modules, interfaces and products for physical security, energy management and IT systems. The company develops and supports mobile and desktop applications while also offering cloud, API and web-based services.

CS security provides an all-in-one solution for personal safety and autonomy. They offer on promotion a PROSERIES OR QOLSYS residential security and alarm systems with basic equipment) and FREE installation.

CSG UK PLC specialise in the installation, maintenance and support of security systems for companies and organisations throughout the UK and Europe. CSG UK supply and install comprehensive security systems for national chains and individual businesses in the form of: CCTV, Access Control, Public Address, Intruder Detection and EAS (Electronic Article Surveillance), Fire and Safes.

Based out of Casablanca, Morocco, CST Securite offers a wide range of video surveillance, door security, home automation, access control, fire detection, anti-theft systems, alarms, queue management and remote monitoring solutions.

CTG Security Matrix is an organisation devoted to providing operational advice and recommendations to guide the planning, design, documentation, installation, maintenance and future upgrades of electronic surveillance systems and control infrastructure.

Established in 2005, Cultris Security Systems Inc. is a full-service fire, security, access control, video and communications company. They specialise in intrusion detection, access control, and video surveillance systems for commercial and residential customers.

Custom Alarm, part of Custom Communications, Inc., specialises in fire alarm systems, intrusion detection, video surveillance, and access control solutions for both residential and commercial owners. They provide organisations with UL certificated systems as well.

Cyelcor Ltd offers solutions such as CCTV, Intruder Alarms, Security Smoke Systems, Fire Alarms, Access Control, Video Door Entry Systems, Smart Home Automation, Oil & Gas Telemetry, Systems, Automated Swimming Pool Dosing. The company also provides consultancy services for home and business owners.

Cynat are an end to end security and automation solution provider for all type of commercial, industrial, organisational and domestic establishments. It deals in all type of CCTV, access control, time attendance products, fire alarms, fire hydrants, intrusion alarms, PA systems, GPS based solutions and customised software.

Cynet 360 is the world's first Autonomous Breach Protection platform that natively integrates XDR endpoint, user and network attack prevention and detection capabilities with an incident engine that fully automates investigation and remediation actions, backed by a 24/7 world-class MDR service. End to end, fully automated breach protection is now within reach of any organization, regardless of security team size and skill level.

D-Fence Electronic Fencing and Security Systems Ltd. is an Israeli "Security-by-Technology" company that designs, develops and manufactures the most advanced Perimeter Intrusion Detection Systems (PIDS), based on an exclusive Strain Gauge Sensor technology. This proprietary technology allows us to offer highly aesthetic PIDS based on the “Open-Design” concept, and most importantly, that work with Zero False Alarms.

D-Ron Group is a leading technology solutions provider that delivers end-to-end solutions to transform its customers' ICT infrastructures. Headquartered in Singapore, the company provides a holistic suite of ICT, Surveillance Products and Services. The company is now the region’s trusted brand for the Security and Surveillance sectors. Their regional network span across Malaysia, Taiwan, Thailand, and China.

D & A Systems is an engineering company, providing electrical and specialist services to industry and commerce. The company offers electrical engineering services, high voltage construction and maintenance, electrical testing and inspection, quality power management, public address & voice alarm systems, CCTV & access control systems, and data network structured cabling.

D&D Security Derby offers fully licensed SIA-approved security guards that are ready to be deployed within hours upon acceptence. It provides approved contractor security services for major companies across the UK. Specialists in static guarding, it offers a cost-effective security service for the protection of UK businesses.

DA Security Systems are a family run CCTV, Fire and Alarm Business. It has been operatiing from Lee-on-the-Solent in Hampshire, UK since 1984. It has over 40yrs experience with the installation and maintenance of CCTV, Fire Alarm, Intruder Alarm, Door Entry and Nurse Call systems.

Dante provides project management services as well as commercial fire and security systems throughout the UK. The company has mechanical and construction divisions. Dante has achieved the quality standard ISO9001 and environmental standard ISO 14001. The company's specialisms include CCTV, door entry, intruder alarms, fire safety, and PA/VA.

Over the past 40 years, Dar Al Riyadh has evolved into a fully-integrated, value-added services company with an emphasis on the engineering value chain. Dar Al Riyadh has been active in the safety and security sector since 1996. They offer complete suite of safety and security systems related to access, public warning, and monitoring. Their services they offer include studies, design, procurement and supply, installation and after sales support.

DAS Technology can design, install and maintain security systems for a wide range of uses from homes, shops and offices to shopping centres, schools and car parks. They provide bespoke security solution that meets your needs, and all completely hassle free. Their nationwide network of engineers is trained to the highest standard in order to install security systems with a professional, efficient and reliable service.

Data Installers Inc. is an IT infrastructure design and network cabling Installation Company. The company specialises in the sales, service, and installation of structured voice and data cabling systems, voice and data integration, fiber work area products plus fibre optic cabling systems. Its complete CCTV surveillance system solutions provide enables users to monitor and view their office or home with computer or smartphone.

Databuoy offers location data and time stamps that instantly notify subscribers about an event and include reports that are time-stamped and geo-coded. They also connect with companies and talented individuals that are inspired to create new intelligent sensing applications and jump into the future of integrated security, safe cities and smart environments.

Datacomm Express is a leading provider of end to end security technology equipment in Nigeria. The company consults, supplies and installs video surveillance equipments, fire safety and protection equipment, home automation and alarm systems, access control solution including biometric, password control devices.

Datastory offers turnkey solutions that elevate the location intelligence so the user can make better business decisions. They believe in the power of location intelligence to turn the invisible visible and give data a voice so that leaders can lead courageously making better business decisions, faster, with confidence.

Davas Group is the specialist in providing the widest range of home security systems throughout Brisbane, with the highest standards of customer care and support. Davas Group has completed projects ranging from securing mall family homes, to creating monitoring solutions for open-plan retail premises, to completely overhauling the security and automation on large sprawling residences with extensive grounds.

DC Solutions is a CCTV installer based in Luton.