Sentry Alarm Systems is a family-owned fire and security company founded in 1971 and headquartered in Monterey. It installs and services fire alarm systems and fire sprinklers and provides 24-hour UL-listed alarm monitoring, alongside security, video surveillance, access control and nurse call systems. It works for hospitality, retail, food service, education, government and industrial clients across Northern California, Oregon and Washington, with offices in Monterey, Oakland, Sacramento, Sonora and Portland. It holds California C-16 Fire Protection Contractor licence 619293 (CSLB) with C-7 and C-10 classifications, California Alarm Company Operator licence ACO 3466, Oregon CCB#243379 and Washington contractor registration SENTRAS787PU.