Something that sets The Voice apart from other singing competitions is the blind auditions. This means the coaches will not be able to see the contestants and only be able to judge them based on the sound of their voice.
The four coaches sit in these high-tech chairs. If they like the voice they’re hearing, they push a red button placed in front of them. This spins their chair around so they can see the singer.
By pressing the red button, this signifies that the coach wants to invite that particular contestant to join their team of 8 singers.
On The Voice, the coaches act more like mentors, offering up their own resources and contacts to their team in hopes of honing their talent and winning over the voting audience.