Residential Security for family and home

Protect your home with our basic Residential system, or ask us
about a custom designed systems specifically tailored to your security needs. More

Commercial Security for small and large business

From small business to high security,
UL Certified Mercantile systems, Intruder Alert will design, install and monitor security and access control for your business around the clock. More


Video Links

Intruder Alert

Arming your security system for when you're home, asleep or away

DMP Keypad Training Videos, Home/Sleep/Away

Meet Intruder Alert Systems of San Antonio


Fire Alarm Systems for family and possessions

Intruder Alert will install smoke and heat sensors wherever they're needed to instantly alert fire department or other emergency responders. More

UL Certified Mercantile Systems

These high security systems are typically used in banks and high-end retail businesses where complete security is required, often by insurance companies. Call 210-494-4900 today to discuss your high security needs.