Sentry Security Service Ltd. Corporate Head Office House#11 (Ground floor), Road#1, Dhanmondi, Dhaka-1205, Bangladesh Phone: 9661577, 9668800, 9662246, 9662247, 9660919, 9660901        Fax: 880-2-8625470 E-mail: info@sentrysecuritybd.com,   ssslbd@gmail.com