"[They use] a laptop or a cellphone - these people are very crafty," Barnes said. "So they're transmitting the data from the matches which doesn't belong to them. What happens when they do that, especially in Europe, they gamble on that. On some of these European betting sites, you can bet for example on a first serve and whether a guy is going to make a fault or not.
"Somebody sitting in the stands with a cellphone can transmit this information to someone in Europe and the guy will bet that the first serve was a fault. And the person who is making the bet will have the information before anybody else so they're actually cheating in that respect.
"So we've instituted these rules and procedures to protect the sport and to keep it clean."
Tournament director Richard Palmer said all information around the people ejected was confidential, in accordance with the Tennis Integrity Unit, which has been involved in the Auckland incidents.
"We see them," Barnes said of the transmitters. "All of us look for that. The chair umpires, linesman, myself, we all look around. We've been trained in how to spot these people. Most of the time it's pretty obvious, everybody in the stands is standing up applauding and one guy is sitting there with his hands in his pockets."
Barnes said he believed the two people ejected were known to the ATP tour.
"It's almost as if it's a career opportunity for some people. They show up everywhere."
While some of the information transmitted could almost as quickly be sent by television viewers in New Zealand, Barnes said it was important to take a stand.
"It's a tennis issue in the sense that we have a clean sport and we want to keep it that way. We don't want to be tarnished with the brush that people are cheating in that way and people assume that it's something we're doing that's causing that. This is our way of trying to protect the integrity of the sport."
