Sentry Security Services 4 years ago ID: #43870 Listed In : Security Systems 3350 Clayton Rd., Suite 220 Concord California 94519 +1 888-736-8791 https://sentrysecurityservices.com/ Business Description Sentry Security Services offers a wide range of security services, including loss prevention, threat detection. Reviews & Ratings Write a Review No Review. Please login / register to add your review. Tags : security company Security Services Security guard service Private security security guard