Block buttons

The block button is a feature of The Voice (American TV series) - Extended.

Activation and deactivation
All buttons are activated at the beginning of "Blind Auditions" and deactivated at the end.

Rules for Deactivation

 * 1) If a coach uses all four of their blocks, all of their buttons deactivate permanently.
 * 2) If a coach uses a block on a coach, the coach who got blocked is permanently deactivated on the coach who blocked them.
 * 3) If a coach turns, all their buttons are deactivated until the end of the audition
 * 4) If a coach has turned, their button on the other coaches are deactivated until the end of the audition.
 * 5) If a coach is blocked, all their buttons are deactivated until the end of the audition.
 * 6) If a coach is blocked more than four times, that coaches buttons are blocked on all other coaches permanently.
 * 7) If a button is permanently deactivated, it can never be reactivated.