The considerate ergonomic design when operating the push-button keyboard is to put the tester in the center.
Moreover it is easier to reach the microphones simultaneously via each individual “Push to Talk” button.
Attached 1 pair of professional headphones allows people to monitor the sound from different microphones easily at the same time. The headphone hangers are mounted in a convenient and easy spot to reach.
The soft cambered surface appearance obviously attracts people’s intention to stand by.