Alarm Detection Systems designs, installs and monitors fire alarm equipment for commercial and residential premises across Chicagoland, northern Illinois, north-west Indiana, southern Wisconsin and Colorado. Its site publishes Illinois private alarm licence 127-000143 and fire sprinkler contractor licence FCS0276, and lists UL accreditation together with membership of The Monitoring Association and the Electronic Security Association. Its Aurora monitoring centre holds TMA Five Diamond designation. The firm has operated continuously since 1968.