SLAs in Jira Software / Core: You don't need to be using Jira Service Management to introduce SLA counters. Extra important, if you're working with an outsourced consulting team that has no access to JSD.
Complex SLAs: Your Service Level Agreement cannot be projected into Jira using status changes? SLA PowerBox allows you to change SLA status based on various events, e.g. adding a comment, changing assignee and much, much more.
Unusual Working Days: You get to define working hours and days in the calendar.
Multiple SLAs within one Jira instance: You can define multiple SLAs for different clients or teams.