What is the dotted sign means, located between the Team A and B switch?
The dot sign located between Team A and B is what we call the "Team Neutral". Once you have selected your team, let's say Team A, the microprocessor is capable to identify whether incoming infrared beam is a friendly shoot or an enemy shoot. The battle game will finish once all your enemies have been defeated. On the other hand, when Team neutral mode is selected, players are not allowed to form a team, every incoming infrared beam is considered as an enemy offense. In a nutshell, Team neutral mode is a game of last man standing, you have to be the last survival member in the battle game.