The 0 Vols informs that no Teacher has Checked in for the Class yet.
We have given the 0 Vols indicator for security reasons. The front desk people Check-In the Students (V4S Members) for the Classes, they can refer the 0 Vols button and then send the students to the classroom.
0 Vols indicates that no Teacher has Checked in for the Class (Shift) yet. So the Students can stay at the front desk until someone checks-in for the Class.