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Nortek Security & Control LLC (formerly Linear LLC)

For over 50 years, Nortek Security & Control LLC has been an innovator in the security market. Nortek Security & Control’s legacy includes the early application of passive infrared detection and radio frequency (RF) transmission, technologies that revolutionized the wireless security and access control industries. Today, Nortek Security & Control delivers class-leading wired and wireless products into a variety of markets serving the access control, security and home technology needs of its customers. A subsidiary of Nortek, Inc., Nortek Security & Control continues to expand its product and engineering prowess, leveraging the knowledge gained from strategic acquisitions and custom product development which will help lead the company into the next 50 years. To learn more, visit


Keepsafer offers all the protection of professionally installed home security products at a fraction of the cost. We offer do-it-yourself home security accessories for your SSD-8 or SSD-16 Security System that are easy to install. Protect your home, loved ones, and property today.

M&S Systems

MTExpress® products are used in residential and commercial installations.

M&S Systems, acquired by Nortek Security & Control LLC, is an industry leader in the design and manufacture of built-in, electronic home amenities for over 50 years. M&S Systems is renowned for applying technology, style and value to products that enrich the enjoyment of the home, from AirVac Central Vacuum Systems to analog and digital Music/Communication and home theater surround sound systems.

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